Anything ever in these safes?

I’m sure that I’ve seen at least one of these in a house and I found these in a truck but has anyone found anything inside of them? they don’t open like loot containers, I guess they are just furniture

You find a few during one of the main story missions, I recall they have stuff in them. I know one had a 5 crown MP5. Svante von Ulmer’s house, room may be locked though. The ones near FOA2 are always empty, I think…