So I asked the guy that had him, and he said he had tried to feed more than one mouse before, but the lil dude wouldn't ever take the second one. I'll find out on Thursday how he is when feeding.
Since I didn't have any idea how big he was going to be I didn't have a hide for him. I'm going to grab a couple of spare hides when I get stuff for the mice Thursday, but for now I got a small Kleenex box and cut it in half so he has a nice dark hide that's about the right size... of course, he's been camped out on top of it since I put it in there. Lil dork :P