Lost child’s backpack Haneda airport

Hello, I’m wondering if it’d be easier/ possible to find my 5 year olds backpack this way.

we were traveling through Haneda August 13th,there’s nothing valuable inside expect the things he treasures.he set down the bag near 7 11 in some far seat row towards amother gate between 11pm-12am. Haneda had not received the bag and we had another flight.

its navy blue decathlon bag, golden brown zipper, a patch on the front that talks about the souls of men. Inside it has a huge purple koala (that he has slept with every night), a small Spider-Man stuffy, captain underpants book, small roll of Oreos.

i don’t if anyone will have found it. But i thought I’d try.
we also lost some AirPods in a japan flight, the were in a gams controller case. Lost July 9th