I saw everything on the xray - his stomach, organs, intestines, poop, air. Nothing metal. They did several positions. If he swallowed it, it would have been in his stomach when I took him in, it wouldn't have had time to travel any further down.
I trust this vet.
He pooped this morning. He went out after dinner (before he threw up), but the wind scared him and he didn't poop, he was getting ready to but ran inside instead. And then threw up. I'll watch carefully tomorrow morning to see what he does.
He is not in pain that I can tell, his spirits are good, he's as ornry as ever. Sleeping now.