I have a friend who puts a weaponlight and extended magazine on his carry pistol at bedtime and takes this stuff off upon arising. After checking out of our motel and getting a couple hundred miles down the road, he became convinced that he had left the extended magazine behind when he put the normal capacity mag in it for carry.
A call back to the motel (in a tiny prairie) caused a good deal of confusion when he asked if they could have the maid check the room for a magazine he'd left behind. The motel owner was happy to help, but thought he was referring to a paper READING magazine. I finally said "tell him it's a CLIP....that had bullets in it....for a PISTOL". NOW the motel owner knew what had gone missing. We had reservations there on the return leg, and were just going to have him hold it there.
No dice. No mag was found. It turned out to be in my friend's luggage.