I left a wrapped gift on the floor in the closet of 2A on a HKG-JFK flight a couple of years ago. I was standing in the line at Immigration when a CX ground staffer in a red jacket came running up to me holding my package. (He was out of breath, having run from the aircraft.) I was truly impressed by the level of service. Compare to the year before when I left a rather large item in the overhead in LH F BOS-MUC. They never noticed.

I'm more careful now when preparing to deplane.