Srilankan Airlines — lost apple watch while boarding onto the flight ul127 from colombo to chennai

I’m writing this complaint with the hope of someone who can come forward to find or return my rose gold apple watch. I was in gate number 6 around 2.30 pm to catch the final call flight number ul127 to chennai where i had my iphone apple watch removed in scan area on to the tray. I remember collecting and keeping my watch in my black backpack but rushing to boarding the flight which is not even more than 50 metres but probably not closing my bag zip. Just immediately after the boarding i checked my bag to take my watch and then realised it was missing. I checked my hand cabin luggage and under my seat too but no sign of watch. By the time the flight moved slowly so i called flight attender and reported the incident. She spoke her senior who have promised me to come back to me once flight gets returned back to colombo from chennai. The attender also got all my personal details. However later today at 22.45 (Indian time), i telephoned security check team and spoke to a lady called vasanthi who actually had checked the cctv confirming me keeping the watch into my backpack however she could not able to collect any details from boarding pass check in area to the flight entrance where likely my watch would have dropped. Could you please help me to find my watch as i’m pretty sure it’s dropped within that few metres of boarding area? It’s not just an expensive watch but it’s a present from my loved one.