Glad to hear the mice won't harm my unsuspecting roomates! About the shed, I'll let you know what happens. Right now he's just been chillin in his warm hide. Oh yeah, one other thing:
Do you think a short length of pvc pipe would make a good hide? Would I need to melt the edges after it was cut?

Thanks for all the help and insight (about the frozen cows and pigs also in my freezer...)!