It's your mate, you know him better than us, you should know what to do!
For all we know, you could owe this guy your life or something. Then him stealing a 20 sac from your open house isn't so bad.

If my pal broke in, he or she goin to jail, or i'll end up in there for kicking the schooby dooby out of them,.. unless he or she saved me in some way and i kinda owed them; as well as related daily to them as a family member; and they cooked themselves food out my kitchen; and so on. If we were tight then I would be bothered but I wouldn't mind as if it was the end of the world. If we aint tight then we got the next biggest problem beside armagedon. I guarantee blood on the ceiling, in fact I feel a moment coming on now!!