The incident happened last evening when a Central Industrial Security Force (CISF) official noticed an unclaimed bag lying at the X-ray scanning machine at Chandni Chowk metro station.
The official immediately segregated the bag for a second scanning and it was found that the bag contained jewellery items worth about Rs 4 lakh, a senior official said.
A Delhi-based jeweller, identified as V Khandelwal, later came back to claim the bag from Metro authorities which was returned to him after due verification.