It is my fault that I left my ear buds in the guest room when check out. I realized that I did not put it in my bag a few hours later, and came back to the hotel. The hotel staffs said they did not find anything left in the room. The receptionist let me go into the room (house keeper already cleaned the room) and search. No trace of earbuds.
I am sure I was using it the night before checking out, and it's gone quickly.
I don't say any more, but it is suspicious housekeeper could take it for her/himself. It is very unfortunate.