diff --git a/.github/scripts/cleanup_cosi_resources.sh b/.github/scripts/cleanup_cosi_resources.sh
index c2d6cef1..e83ff468 100755
--- a/.github/scripts/cleanup_cosi_resources.sh
+++ b/.github/scripts/cleanup_cosi_resources.sh
@@ -52,12 +52,12 @@ for BUCKET_NAME in $BUCKET_NAMES; do
 done
 
 log_and_run echo "Deleting Bucket Access Class..."
-log_and_run kubectl delete -f cosi-examples/bucketaccessclass.yaml --all || { echo "No BucketAccessClass resources found." | tee -a "$LOG_FILE"; }
+log_and_run kubectl delete -f cosi-examples/greenfield/bucketaccessclass.yaml --all || { echo "No BucketAccessClass resources found." | tee -a "$LOG_FILE"; }
 
 log_and_run echo "Deleting Bucket Class and Bucket Claim..."
-log_and_run kubectl delete -f cosi-examples/bucketclass.yaml || { echo "Bucket Class not found." | tee -a "$LOG_FILE"; }
-log_and_run kubectl delete -f cosi-examples/bucketclaim.yaml || { echo "Bucket Claim not found." | tee -a "$LOG_FILE"; }
-log_and_run kubectl delete -f cosi-examples/bucketclass-delete-on-claim-removal.yaml || { echo "Bucket Class not found." | tee -a "$LOG_FILE"; }
+log_and_run kubectl delete -f cosi-examples/greenfield/bucketclass.yaml || { echo "Bucket Class not found." | tee -a "$LOG_FILE"; }
+log_and_run kubectl delete -f cosi-examples/greenfield/bucketclaim.yaml || { echo "Bucket Claim not found." | tee -a "$LOG_FILE"; }
+log_and_run kubectl delete -f cosi-examples/greenfield/bucketclass-deletion-policy.yaml || { echo "Bucket Class not found." | tee -a "$LOG_FILE"; }
 
 log_and_run echo "Deleting s3-secret-for-cosi secret..."
 log_and_run kubectl delete secret s3-secret-for-cosi --namespace=default || { echo "Secret s3-secret-for-cosi not found." | tee -a "$LOG_FILE"; }
diff --git a/.github/scripts/e2e_tests_brownfield_use_case.sh b/.github/scripts/e2e_tests_brownfield_use_case.sh
new file mode 100755
index 00000000..bc4eefca
--- /dev/null
+++ b/.github/scripts/e2e_tests_brownfield_use_case.sh
@@ -0,0 +1,119 @@
+#!/bin/bash
+set -e
+
+LOG_FILE=".github/e2e_tests/artifacts/logs/e2e_tests/brownfield.log"
+mkdir -p "$(dirname "$LOG_FILE")"
+
+HOST_IP=$(hostname -I | awk '{print $1}')
+SECRET_NAME="brownfield-bucket-secret"
+IAM_ENDPOINT="http://$HOST_IP:8600"
+S3_ENDPOINT="http://$HOST_IP:8000"
+BUCKET_NAME="brownfield-bucket"
+NAMESPACE="scality-object-storage"
+REGION="us-west-1"
+
+# Error handling function
+error_handler() {
+  echo "An error occurred during bucket creation tests. Check the log file for details." | tee -a "$LOG_FILE"
+  echo "Failed command: $BASH_COMMAND" | tee -a "$LOG_FILE"
+  exit 1
+}
+
+# Trap errors and call the error handler
+trap 'error_handler' ERR
+
+# Log command execution to the log file for debugging
+log_and_run() {
+  "$@" 2>&1 | tee -a "$LOG_FILE"
+}
+
+
+# Create the bucket fir brownfield scenario
+log_and_run echo "Creating bucket: $BUCKET_NAME"
+log_and_run aws s3api create-bucket --bucket "$BUCKET_NAME" --region $REGION --endpoint-url "$S3_ENDPOINT"
+
+# Check if the bucket exists
+log_and_run echo "Checking if bucket $BUCKET_NAME exists"
+aws --endpoint-url "$S3_ENDPOINT" s3api head-bucket --bucket "$BUCKET_NAME"
+log_and_run echo "Bucket $BUCKET_NAME exists!"
+
+log_and_run echo "Applying Bucket Class to use existing bucket..."
+log_and_run kubectl apply -f cosi-examples/brownfield/bucketclass.yaml
+
+log_and_run echo "Manually creating Bucket object with existing bucket..."
+log_and_run kubectl apply -f cosi-examples/brownfield/bucket.yaml
+
+log_and_run echo "Applying Bucket Claim referencing the Bucket object..."
+log_and_run kubectl apply -f cosi-examples/brownfield/bucketclaim.yaml
+
+log_and_run echo "Applying Bucket Access Class..."
+log_and_run kubectl apply -f cosi-examples/brownfield/bucketaccessclass.yaml
+
+log_and_run echo "Applying Bucket Access..."
+log_and_run kubectl apply -f cosi-examples/brownfield/bucketaccess.yaml
+
+log_and_run echo "Verifying brownfield-bucket-secret in the default namespace..."
+SECRET_JSON="$(kubectl get secret "$SECRET_NAME" --namespace "$NAMESPACE" -o json)"
+
+# Decode the Base64 encoded BucketInfo
+BUCKET_INFO_BASE64="$(echo "$SECRET_JSON" | jq -r '.data.BucketInfo')"
+BUCKET_INFO_JSON="$(echo "$BUCKET_INFO_BASE64" | base64 --decode)"
+
+log_and_run echo "Decoded BucketInfo: $BUCKET_INFO_JSON"
+
+# Extract values to verify
+ACTUAL_BUCKET_NAME=$(echo "$BUCKET_INFO_JSON" | jq -r '.spec.bucketName')
+ACTUAL_ENDPOINT=$(echo "$BUCKET_INFO_JSON" | jq -r '.spec.secretS3.endpoint')
+ACTUAL_REGION=$(echo "$BUCKET_INFO_JSON" | jq -r '.spec.secretS3.region')
+ACTUAL_ACCESS_KEY_ID=$(echo "$BUCKET_INFO_JSON" | jq -r '.spec.secretS3.accessKeyID')
+ACTUAL_ACCESS_SECRET_KEY=$(echo "$BUCKET_INFO_JSON" | jq -r '.spec.secretS3.accessSecretKey')
+ACTUAL_PROTOCOLS=$(echo "$BUCKET_INFO_JSON" | jq -c '.spec.protocols')
+
+# Verify bucketName
+if [[ "$ACTUAL_BUCKET_NAME" != "$BUCKET_NAME" ]]; then
+  log_and_run echo "Bucket name mismatch! Expected: $BUCKET_NAME, Found: $ACTUAL_BUCKET_NAME"
+  exit 1
+fi
+
+# Verify endpoint
+EXPECTED_ENDPOINT="$S3_ENDPOINT"
+if [[ "$ACTUAL_ENDPOINT" != "$EXPECTED_ENDPOINT" ]]; then
+  log_and_run echo "Endpoint mismatch! Expected: $EXPECTED_ENDPOINT, Found: $ACTUAL_ENDPOINT"
+  exit 1
+fi
+
+# Verify region
+if [[ "$ACTUAL_REGION" != "$REGION" ]]; then
+  log_and_run echo "Region mismatch! Expected: $REGION, Found: $ACTUAL_REGION"
+  exit 1
+fi
+
+# Verify accessSecretKey exists
+if [[ -z "$ACTUAL_ACCESS_KEY_ID" ]]; then
+  log_and_run echo "AccessSecretKey is empty!"
+  exit 1
+fi
+
+# Verify accessSecretKey exists
+if [[ -z "$ACTUAL_ACCESS_SECRET_KEY" ]]; then
+  log_and_run echo "AccessSecretKey is empty!"
+  exit 1
+fi
+
+# Verify protocol
+EXPECTED_PROTOCOLS='["s3"]'
+if [[ "$ACTUAL_PROTOCOLS" != "$EXPECTED_PROTOCOLS" ]]; then
+  log_and_run echo "Protocols mismatch! Expected: $EXPECTED_PROTOCOLS, Found: $ACTUAL_PROTOCOLS"
+  exit 1
+fi
+
+# cleanup
+log_and_run kubectl delete -f cosi-examples/brownfield/bucketaccess.yaml
+log_and_run kubectl delete -f cosi-examples/brownfield/bucketaccessclass.yaml
+log_and_run kubectl delete -f cosi-examples/brownfield/bucketclaim.yaml
+log_and_run kubectl delete -f cosi-examples/brownfield/bucketclass.yaml
+
+# Check if the bucket is not deleted and Retain policy is respected
+log_and_run echo "Checking if bucket $BUCKET_NAME exists"
+aws --endpoint-url "$S3_ENDPOINT" s3api head-bucket --bucket "$BUCKET_NAME"
+log_and_run echo "Bucket $BUCKET_NAME has been retained!"
diff --git a/.github/scripts/e2e_tests.sh b/.github/scripts/e2e_tests_greenfield_use_case.sh
similarity index 93%
rename from .github/scripts/e2e_tests.sh
rename to .github/scripts/e2e_tests_greenfield_use_case.sh
index e0e5b89a..9f875805 100755
--- a/.github/scripts/e2e_tests.sh
+++ b/.github/scripts/e2e_tests_greenfield_use_case.sh
@@ -2,7 +2,7 @@
 set -e
 
 # Define log file for debugging
-LOG_FILE=".github/e2e_tests/artifacts/logs/e2e_tests/bucket_creation_test.log"
+LOG_FILE=".github/e2e_tests/artifacts/logs/e2e_tests/greenfield.log"
 mkdir -p "$(dirname "$LOG_FILE")"  # Ensure the log directory exists
 
 CONTAINER_NAME=s3_and_iam_deployment-iam-1
@@ -83,19 +83,19 @@ EOF
 
 # Step 4: Apply Bucket Class
 log_and_run echo "Applying Bucket Class..."
-log_and_run kubectl apply -f cosi-examples/bucketclass.yaml
+log_and_run kubectl apply -f cosi-examples/greenfield/bucketclass.yaml
 
 # Step 5: Apply Bucket Claim
 log_and_run echo "Applying Bucket Claim..."
-log_and_run kubectl apply -f cosi-examples/bucketclaim.yaml
+log_and_run kubectl apply -f cosi-examples/greenfield/bucketclaim.yaml
 
 # Step 6: Apply Bucket Access Class
 log_and_run echo "Applying Bucket Access Class..."
-log_and_run kubectl apply -f cosi-examples/bucketaccessclass.yaml
+log_and_run kubectl apply -f cosi-examples/greenfield/bucketaccessclass.yaml
 
 # Step 7: Apply Bucket Access
 log_and_run echo "Applying Bucket Access..."
-log_and_run kubectl apply -f cosi-examples/bucketaccess.yaml
+log_and_run kubectl apply -f cosi-examples/greenfield/bucketaccess.yaml
 
 # Step 8: Verify Bucket Creation with Retry
 log_and_run echo "Listing all S3 buckets before verification..."
@@ -213,7 +213,7 @@ fi
 
 # Step 11: Delete Bucket Access Resource
 log_and_run echo "Deleting Bucket Access Resource..."
-log_and_run kubectl delete -f cosi-examples/bucketaccess.yaml
+log_and_run kubectl delete -f cosi-examples/greenfield/bucketaccess.yaml
 
 # Step 12: Verify IAM User Deletion
 log_and_run echo "Verifying IAM user '$IAM_USER_NAME' deletion..."
@@ -230,8 +230,8 @@ fi
 # Step 13: Test deletion bucket with deletion policy set
 
 log_and_run echo "Applying Bucket Class with deletion policy and respective Bucket Claim..."
-log_and_run kubectl apply -f cosi-examples/bucketclass-deletion-policy.yaml
-log_and_run kubectl apply -f cosi-examples/bucketclaim-deletion-policy.yaml
+log_and_run kubectl apply -f cosi-examples/greenfield/bucketclass-deletion-policy.yaml
+log_and_run kubectl apply -f cosi-examples/greenfield/bucketclaim-deletion-policy.yaml
 
 log_and_run echo "Listing all S3 buckets before deletion..."
 log_and_run aws s3 ls --endpoint-url "$S3_ENDPOINT"
@@ -259,7 +259,7 @@ if [ -z "$BUCKET_TO_BE_DELETED" ]; then
 fi
 
 log_and_run echo "Deleting Bucket Claim..."
-log_and_run kubectl delete -f cosi-examples/bucketclaim-deletion-policy.yaml
+log_and_run kubectl delete -f cosi-examples/greenfield/bucketclaim-deletion-policy.yaml
 
 # Check if the bucket with name $BUCKET_TO_BE_DELETED exists by doing a head bucket.
 # If bucket exists, retry with ATTEMPTS and DELAY. If bucket is not found, test success.
diff --git a/.github/workflows/ci-e2e-tests.yml b/.github/workflows/ci-e2e-tests.yml
index 8ec0e6f3..60d339aa 100644
--- a/.github/workflows/ci-e2e-tests.yml
+++ b/.github/workflows/ci-e2e-tests.yml
@@ -96,10 +96,13 @@ jobs:
         docker save "$CLOUDSERVER_IMAGE" -o /tmp/.docker_cache/cloudserver_image.tar
       shell: bash
 
-    - name: E2E tests for COSI driver using kustomize
+    - name: E2E tests for greenfield use case using kustomize
       run: |
-        pwd
-        .github/scripts/e2e_tests.sh
+        .github/scripts/e2e_tests_greenfield_use_case.sh
+
+    - name: E2E tests for brownfield use case using kustomize
+      run: |
+        .github/scripts/e2e_tests_brownfield_use_case.sh
 
     - name: "Delay completion"
       if: ${{ github.event_name == 'workflow_dispatch' && inputs.debug_enabled }}
diff --git a/cosi-examples/brownfield/bucket.yaml b/cosi-examples/brownfield/bucket.yaml
new file mode 100644
index 00000000..76969896
--- /dev/null
+++ b/cosi-examples/brownfield/bucket.yaml
@@ -0,0 +1,16 @@
+apiVersion: objectstorage.k8s.io/v1alpha1
+kind: Bucket
+metadata:
+  name: brownfield-bucket # should be same as bucket name
+  namespace: scality-object-storage
+spec:
+  bucketClaim: {}
+  bucketClassName: brownfield-bucket-class
+  driverName: cosi.scality.com
+  deletionPolicy: Retain
+  existingBucketID: brownfield-bucket # name of pre-existing bucket in S3
+  parameters:
+    objectStorageSecretName: s3-secret-for-cosi
+    objectStorageSecretNamespace: default
+  protocols:
+    - S3
diff --git a/cosi-examples/brownfield/bucketaccess.yaml b/cosi-examples/brownfield/bucketaccess.yaml
new file mode 100644
index 00000000..e0d7796c
--- /dev/null
+++ b/cosi-examples/brownfield/bucketaccess.yaml
@@ -0,0 +1,10 @@
+apiVersion: objectstorage.k8s.io/v1alpha1
+kind: BucketAccess
+metadata:
+  name: brownfield-bucket-access
+  namespace: scality-object-storage
+spec:
+  bucketAccessClassName: brownfield-bucket-access-class
+  bucketClaimName: brownfield-bucket-claim
+  credentialsSecretName: brownfield-bucket-secret
+  protocol: s3
diff --git a/cosi-examples/brownfield/bucketaccessclass.yaml b/cosi-examples/brownfield/bucketaccessclass.yaml
new file mode 100644
index 00000000..05137647
--- /dev/null
+++ b/cosi-examples/brownfield/bucketaccessclass.yaml
@@ -0,0 +1,10 @@
+kind: BucketAccessClass
+apiVersion: objectstorage.k8s.io/v1alpha1
+metadata:
+  name: brownfield-bucket-access-class
+  namespace: scality-object-storage
+driverName: cosi.scality.com
+authenticationType: KEY
+parameters:
+  objectStorageSecretName: s3-secret-for-cosi
+  objectStorageSecretNamespace: default
diff --git a/cosi-examples/brownfield/bucketclaim.yaml b/cosi-examples/brownfield/bucketclaim.yaml
new file mode 100644
index 00000000..482bfdde
--- /dev/null
+++ b/cosi-examples/brownfield/bucketclaim.yaml
@@ -0,0 +1,10 @@
+apiVersion: objectstorage.k8s.io/v1alpha1
+kind: BucketClaim
+metadata:
+  name: brownfield-bucket-claim
+  namespace: scality-object-storage
+spec:
+  bucketClassName: brownfield-bucket-class
+  existingBucketName: brownfield-bucket # name of Bucket object
+  protocols:
+    - S3
diff --git a/cosi-examples/brownfield/bucketclass.yaml b/cosi-examples/brownfield/bucketclass.yaml
new file mode 100644
index 00000000..622863eb
--- /dev/null
+++ b/cosi-examples/brownfield/bucketclass.yaml
@@ -0,0 +1,10 @@
+apiVersion: objectstorage.k8s.io/v1alpha1
+kind: BucketClass
+metadata:
+  name: brownfield-bucket-class
+  namespace: scality-object-storage
+driverName: cosi.scality.com
+deletionPolicy: Delete
+parameters:
+  objectStorageSecretName: s3-secret-for-cosi
+  objectStorageSecretNamespace: default
diff --git a/cosi-examples/bucketaccess.yaml b/cosi-examples/greenfield/bucketaccess.yaml
similarity index 100%
rename from cosi-examples/bucketaccess.yaml
rename to cosi-examples/greenfield/bucketaccess.yaml
diff --git a/cosi-examples/bucketaccessclass.yaml b/cosi-examples/greenfield/bucketaccessclass.yaml
similarity index 100%
rename from cosi-examples/bucketaccessclass.yaml
rename to cosi-examples/greenfield/bucketaccessclass.yaml
diff --git a/cosi-examples/bucketclaim-deletion-policy.yaml b/cosi-examples/greenfield/bucketclaim-deletion-policy.yaml
similarity index 100%
rename from cosi-examples/bucketclaim-deletion-policy.yaml
rename to cosi-examples/greenfield/bucketclaim-deletion-policy.yaml
diff --git a/cosi-examples/bucketclaim.yaml b/cosi-examples/greenfield/bucketclaim.yaml
similarity index 100%
rename from cosi-examples/bucketclaim.yaml
rename to cosi-examples/greenfield/bucketclaim.yaml
diff --git a/cosi-examples/bucketclass-deletion-policy.yaml b/cosi-examples/greenfield/bucketclass-deletion-policy.yaml
similarity index 100%
rename from cosi-examples/bucketclass-deletion-policy.yaml
rename to cosi-examples/greenfield/bucketclass-deletion-policy.yaml
diff --git a/cosi-examples/bucketclass.yaml b/cosi-examples/greenfield/bucketclass.yaml
similarity index 100%
rename from cosi-examples/bucketclass.yaml
rename to cosi-examples/greenfield/bucketclass.yaml
diff --git a/docs/driver-params.md b/docs/driver-params.md
index f9b8b740..c9c56bd8 100644
--- a/docs/driver-params.md
+++ b/docs/driver-params.md
@@ -9,7 +9,7 @@ The table below details the configuration parameters for BucketClass, which dete
 | `objectStorageSecretName`         | The name of the Kubernetes secret containing S3 credentials and configuration. | `string`                   | Yes          |
 | `objectStorageSecretNamespace`    | The namespace in which the secret is located (e.g., `default`).                | `string` (e.g., `default`) | Yes          |
 
-[Example](../cosi-examples/bucketclass.yaml)
+[Example](../cosi-examples/greenfield/bucketclass.yaml)
 
 ## Configuration Parameters for Kubernetes secret containing S3 credentials and configuration
 
diff --git a/pkg/driver/provisioner_server_impl.go b/pkg/driver/provisioner_server_impl.go
index 1b8f0ed9..d5cba7cc 100644
--- a/pkg/driver/provisioner_server_impl.go
+++ b/pkg/driver/provisioner_server_impl.go
@@ -129,16 +129,10 @@ func (s *ProvisionerServer) DriverCreateBucket(ctx context.Context,
 	err = s3Client.CreateBucket(ctx, bucketName, *s3Params)
 	if err != nil {
 		var bucketAlreadyExists *s3types.BucketAlreadyExists
-		var bucketOwnedByYou *s3types.BucketAlreadyOwnedByYou
 
 		if errors.As(err, &bucketAlreadyExists) {
 			klog.V(c.LvlInfo).InfoS("Bucket already exists", "bucketName", bucketName)
 			return nil, status.Errorf(codes.AlreadyExists, "Bucket already exists: %s", bucketName)
-		} else if errors.As(err, &bucketOwnedByYou) {
-			klog.V(c.LvlInfo).InfoS("Bucket already exists and is owned by you", "bucketName", bucketName)
-			return &cosiapi.DriverCreateBucketResponse{
-				BucketId: bucketName,
-			}, nil
 		} else {
 			klog.ErrorS(err, "Failed to create bucket", "bucketName", bucketName)
 			return nil, status.Error(codes.Internal, "Failed to create bucket")
diff --git a/pkg/driver/provisioner_server_impl_test.go b/pkg/driver/provisioner_server_impl_test.go
index 82af5866..6775c5fa 100644
--- a/pkg/driver/provisioner_server_impl_test.go
+++ b/pkg/driver/provisioner_server_impl_test.go
@@ -271,16 +271,6 @@ var _ = Describe("ProvisionerServer DriverCreateBucket", Ordered, func() {
 		Expect(status.Code(err)).To(Equal(codes.AlreadyExists))
 	})
 
-	It("should return success if bucket already owned by you", func(ctx SpecContext) {
-		mockS3.CreateBucketFunc = func(ctx context.Context, input *s3.CreateBucketInput, _ ...func(*s3.Options)) (*s3.CreateBucketOutput, error) {
-			return nil, &types.BucketAlreadyOwnedByYou{}
-		}
-
-		resp, err := provisioner.DriverCreateBucket(ctx, request)
-		Expect(err).To(BeNil())
-		Expect(resp.BucketId).To(Equal(testBucketName))
-	})
-
 	It("should return Internal error for other S3 errors", func(ctx SpecContext) {
 		mockS3.CreateBucketFunc = func(ctx context.Context, input *s3.CreateBucketInput, _ ...func(*s3.Options)) (*s3.CreateBucketOutput, error) {
 			return nil, errors.New("SomeOtherError")