When this subject comes up, it is usually also noted that many times the leftovers are dibbed during predeparture and later taken to the rear galley for consumption.

Taking more than was preplanned during pre-departure many times will usually get your neck broken, so quite frankly, you were very, very lucky as others who have palmed an extra or two are still in neck braces and unable to occupy exit rows for months on end (if not upgraded).

Think of the snack basket sort-a like a zebra down on the Serengeti with the lioness promising to return to the lair with sustenance, and some dude cops an extra "Sea Salt Chip"!