I think at this point Petey doesn't like Obi too much for the superhero heroics and thinks it was a rather daft move all around...so yeah, he'll just let that grudge stew on his insides and will go on with his life. He wouldn't say anything about the saber, since I doubt he'd be saying much at all.
I don't think it needs further addressed or it could turn volatile and I'm not sure I want to play that out, really. It's just the way he is. So this is one sleeping dog that is probably left where it's laying.