diff --git a/weed/s3api/s3api_object_handlers.go b/weed/s3api/s3api_object_handlers.go
index bfaeb568b..fbd3d1011 100644
--- a/weed/s3api/s3api_object_handlers.go
+++ b/weed/s3api/s3api_object_handlers.go
@@ -211,15 +211,13 @@ func newListEntry(entry *filer_pb.Entry, key string, dir string, name string, bu
 			ownerID = s3_constants.AccountAnonymousId
 			displayName = "anonymous"
 		} else {
-			// Try to resolve display name from IAM system
-			displayName = "unknown"
-			// Note: IAM resolution would require access to the S3ApiServer instance
-			// For now, use a simple fallback or could be enhanced later
-		}
+			// Use the ownerID as displayName if no better option is available
+			displayName = ownerID
 
-		// Additional fallback to file system username if available and no display name resolved
-		if displayName == "unknown" && entry.Attributes.UserName != "" {
-			displayName = entry.Attributes.UserName
+			// Additional fallback to file system username if available and different from ownerID
+			if entry.Attributes.UserName != "" && entry.Attributes.UserName != ownerID {
+				displayName = entry.Attributes.UserName
+			}
 		}
 
 		listEntry.Owner = CanonicalUser{
diff --git a/weed/s3api/s3api_object_handlers_list.go b/weed/s3api/s3api_object_handlers_list.go
index 0e9e58c40..fb729e8e9 100644
--- a/weed/s3api/s3api_object_handlers_list.go
+++ b/weed/s3api/s3api_object_handlers_list.go
@@ -148,6 +148,25 @@ func (s3a *S3ApiServer) listFilerEntries(bucket string, originalPrefix string, m
 		prefixEndsOnDelimiter: strings.HasSuffix(originalPrefix, "/") && len(originalMarker) == 0,
 	}
 
+	// Special case: when maxKeys = 0, return empty results immediately
+	if maxKeys == 0 {
+		response = ListBucketResult{
+			Name:           bucket,
+			Prefix:         originalPrefix,
+			Marker:         originalMarker,
+			NextMarker:     "",
+			MaxKeys:        int(maxKeys),
+			Delimiter:      delimiter,
+			IsTruncated:    false,
+			Contents:       contents,
+			CommonPrefixes: commonPrefixes,
+		}
+		if encodingTypeUrl {
+			response.EncodingType = s3.EncodingTypeUrl
+		}
+		return
+	}
+
 	// check filer
 	err = s3a.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {
 		for {