Index: src/wp-admin/includes/class-wp-media-list-table.php
===================================================================
--- src/wp-admin/includes/class-wp-media-list-table.php	(revision 29463)
+++ src/wp-admin/includes/class-wp-media-list-table.php	(working copy)
@@ -33,12 +33,13 @@
 	}
 
 	public function prepare_items() {
-		global $lost, $wp_query, $post_mime_types, $avail_post_mime_types, $mode;
+		global $wp_query, $post_mime_types, $avail_post_mime_types, $mode;
 
 		$q = $_REQUEST;
 
-		if ( !empty( $lost ) )
-			$q['post__in'] = implode( ',', $lost );
+		if ( ! empty( $q['lost'] ) ) {
+			$q['post__in'] = wp_parse_id_list( $q['lost'] );
+		}
 
 		list( $post_mime_types, $avail_post_mime_types ) = wp_edit_attachments_query( $q );
 
Index: src/wp-admin/upload.php
===================================================================
--- src/wp-admin/upload.php	(revision 29463)
+++ src/wp-admin/upload.php	(working copy)
@@ -102,7 +102,9 @@
 				)
 			" );
 
-			$_REQUEST['detached'] = 1;
+			if ( $lost ) {
+				$location = add_query_arg( 'lost', implode( ',', $lost ), $location );
+			}
 			break;
 		case 'attach':
 			$parent_id = (int) $_REQUEST['found_post_id'];