It would depend on what exactly they are. Weapons he may waffle about first, anything else he would give up to Lucifer no problem though he'd certainly verbally accent how nice and helpful he's being even though Lucifer is full of poop, as he implied their last conversation.

Tl;dr he wants the adventure but he's still Mad and doesn't trust the contract/rewards in general (too good to be true) so if possible he wants to avoid doing it by the letter. (If not, he'll eventually agree because he wants to see what's out there, damn it.)