Something a little different on two of the three keys I pictured, Bob. The back has the date and time scheduled for checkout printed on it. It doesn't appear that this could be erased, so the keys are obviously intended for one-time use.

If I were the desk clerk and someone came up and asked for a bunch of keys of people who just checked out, I would be very suspicious. Would be surprised if you could do this. Get a room for half a day for whatever purpose? Pick up any left items from the last occupant? I doubt this will be done willingly. However, the roulette rascals will probably find a way to do it!

DonL