I have no idea who this belongs to or what it's for but it might be the cutes little lock I've ever seen. If I had to guess, it looks like a lock to a diary, I'm sure I left a couple laying around as a kid.
This one definitely falls into misc. This isn't the best picture, but at least you can see the coffee stains which are still there. He had a few more of these, I only took two of them. They where tucked in his desk, which makes me think that these were saved for a reason.