My Last Trip was in 2018
It's possible the next rider in that seat (a) grabbed them up with all their stuff, or (b) thanked you in absentia for your generosity.Meanwhile, I once left a pair of sunglasses in the pouch on Space Mountain and reported it to an unload CM with seat position and rocket number before the vehicle even had time to complete its return to the load area . . . and they haven't been seen since.
So, you know. Progress!