Most of the chamber maids at las casinos I've dealt with, barely speak English (and I don't speak Spanish), so trying to explain something to them is a difficult task for me.
In reference to my op, when I stay in a room I generally "live out of my carry-on", I rarely have things placed in drawers or closets. So it could look like I abandoned my property--but some further checking should be done before disposing of these items.