We don't have to check the SPCA, because he has an ear tattoo that will make them call us if he shows up there. Also, he hasn't lost his collar in years, so there's a pretty good chance that he will still have it this time too.

I should put out water - thank you for the suggestion! And I'll send Russ up to our old place tonight with posters. We doubt that's what's happened, since he has been going in and out of the new place for almost a month now, but it never hurts to check.