"So... what if it just disappears somewhere else? No way to find it or get to it?" He has taken in the information she's given him, and honestly a church-ruled world ain't exactly high on his list of things that need to happen; even if it's not in his world. He also may or may not be thinking of the bunker, being nigh-impenetrable to basically everything that you wouldn't want having anything like that. As Zack said, they're friends and he does want to help, even if he's mentally bitching that he can't even have breakfast without something cropping up. "They can't find out you have it if you don't."