diff --git a/routers/returns.py b/routers/returns.py
index bed929c..780fb3b 100644
--- a/routers/returns.py
+++ b/routers/returns.py
@@ -68,12 +68,15 @@ async def return_lookup(tracking_no: str):
         conn = get_order_db_conn()
         cur = conn.cursor()
         # 주문일시(order_date 또는 upload_date) 기준 가장 최신 1건 조회
-        cur.execute("""
+        cur.execute(r"""
             SELECT vendor, recipient_name, recipient_phone, recipient_mobile, address
             FROM orders 
-            WHERE tracking_number = %s
+            WHERE tracking_number = %s 
+               OR (tracking_number IS NOT NULL 
+                   AND tracking_number != '' 
+                   AND %s = ANY(regexp_split_to_array(tracking_number, '[,\s/;]+')))
             ORDER BY order_date DESC LIMIT 1
-        """, (tracking_no,))
+        """, (tracking_no, tracking_no))
         row = cur.fetchone()
         conn.close()
         
@@ -164,12 +167,15 @@ async def create_return_receive_bulk(req: BulkReturnReceive):
             else:
                 remarks = "고객이 반품"
                 # 2. Check orders
-                cur_order.execute("""
+                cur_order.execute(r"""
                     SELECT vendor, recipient_name, recipient_phone, recipient_mobile, address 
                     FROM orders 
                     WHERE tracking_number = %s 
+                       OR (tracking_number IS NOT NULL 
+                           AND tracking_number != '' 
+                           AND %s = ANY(regexp_split_to_array(tracking_number, '[,\s/;]+')))
                     ORDER BY order_date DESC LIMIT 1
-                """, (tracking_no,))
+                """, (tracking_no, tracking_no))
                 ord_row = cur_order.fetchone()
                 if ord_row:
                     mall = ord_row['vendor'] or ""