Hey Sarge,
How 'bout one of them bear traps like ya' see in the Wile E. Coyote cartoons? (just kidding!)

As far as your buddy goes it just sounds like he wanted to be paid $100 to sit in your attic and get drunk. Tell him you'll give him $10 for identification and the other $90 and beverages come after he catches the dang thing!
One note: if it's a coon I've found even the live traps might not work. Sometimes they will if you're lucky (and get a stupid coon--which is rare) but I've only got that to work like once or twice. We had a coon that got in our garden--tried to trap him. I even closed one end of the trap and tied the bait (sausage) to the closed end with 8 different strings (I couldn't remove the bait without a knife if I tried)--next morning I had a pile of 8 strings still tied to the cage but NO BAIT and No COON. Hope you have better luck!