Well it happened to me. I left my Nikon P5000 in seat 2D on UA1220 to RDU. I sent UA Customer Relations people a message but whether they come up with it is anyone's guess.
On this DEN-RDU flight, it was incredible to see the amount of flooding west of the Mississippi. I had the pictures marked with my Garmin eTrex Venture CX. Now I lost those pictures.