Yes, if there are papers in the hallway, then someone took yours, and if none, then nope. I'd do the same (and have) - bring it up.

ps - one time in vegas at a hilton i saw someone taking someone elses paper & said excuse me, is that yours/your room (since i'd just seen him exit a room farther down the hall i knew it wasn't). he dropped it, mumbled something & scurried away (so i then took the paper - kidding).

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Sharon