Airport Authorities/Airlines
Baggage lost at X-ray check

I was traveling on the Flight TG 671 from Pucket to Bangkok to Delhi on 4 Feb i kept my small hand baggage (Paper bag having A brand new SEIKO wrist watch) on the X-ray security check, i was in hurry and i forget the bag at the screening. In the plan i recalled and after the landing at Bangkok i informed the Airlines / Airport Information. But till now nobody has responsible answer. This bag have a watch with guarantee card and Portrait. I have the Original bill with me. If any of you can help me in this regard