Where's Emo?

The cat got out. He's never allowed outside, and for some unknown reason the garage back door was open just a crack. We can't find him, and my stomach hurts. He's not a street smart cat.
The weird things is we found him almost exactly a year ago roaming the streets without a collar. And about a week ago he lost his collar. It was a safety snap one, and we just can't find it. Now he's roaming the streets without a collar again, exactly a year from when we found him. I don't like that. I want him asleep inside like in this picture.