In the early Thailand days, there weren't safes in the rooms, the choice was using one behind reception, or an envelope in the hotel safe. In the latter case, we had a lot of missing items in the morning, one being the night shift receptionist. I have recollections of a locked bag in a locked suitcase, secured to an immovable object with a computer cable lock! The Lek Hotel had safes with some fancy magnetic key, but you needed to hide that before fun and games and passing out!