It was not okay, and you did the right thing. He stole your property, and as such is charged with theft.
I agree with your actions, I'm just sorry it had to happen. I'm glad you got the rats back. When I read the part about him 'disposing of them' I had a sinking feeling that he might have done something awful to them.
I'm really glad it turned out better than I thought it might. Get a lock for your door or something, I guess.