I have magnetic key boxes on each game with the games keys in the boxes. That way they're available if needed but not TOO accessible either. I don't like to have the keys in the coin doors 1 because little fingers are attracted to them and they could end up missing this is also the reason I don't care for the thumb lock ones...makes it too easy for curious kiddos (or anyone else that doesn't need to be messing around inside my games) to open coin doors and get into them...there are too many electrical hook ups and the speaker and transformer are not that far from the coin door, kiddos could get a good shock then we would have mad parents blaming us for their kids getting hurt. and 2 They tend to hurt if you are playing and bump knees into them, not to mention that they can get broken off in the lock and 3 I take my games to shows also why I don't do thumb locks...I'm not swapping for a real lock everytime I take my game to a show so they get put in the storage box so if we need them we got them but they're not in the coin door for everyone at the show to help themselves!
Phoebe