I'm sorry to bring this matter to your attention because I'm most likely at fault as well.
After my return from holiday, I noticed that my ipad1 was missing from my room. I use that ipad often for internet music and had forgotten to put it away. When I realised this back home I didnt bother to ask to put it away as during my stay in Bangkok I always leave it openly in my room.
Perhaps some of your staff have noticed this and decided that it was better to take it to a safe location rather then leaving it where it was, if not then its my fault in not being too careful.
Could you please ask around?