Not sure about the gold difference, but I figure it's best to not show him up like that. I'm personally a pedant and would probably pick 1, but I'm aware enough to know nobody likes a pedant.
2's the worst. They can probably assume that we're lab testing them on their own. 4 is a bit weak. I was tossing between 1 and 3, decided to go with 1 because 3 seemed kind of sensationalist to kick off with. A good case could be made that it's just the most interesting/unusual one, I just don't want anyone jumping off about the punctures.
I figure the people shadowing will have a better idea of him than the people stalling him, though I guess Rose and Lucy would have personal experience with how he acts and speaks, and if he seemed nervous or calm or what.
I'm figuring that the whole apartment's a show and he only pretends to live there, because extraterrestrial shenanigans. and because of those, he doesn't quite understand the little mistakes. Nothing's touched, nothing's used. No prescriptions, just pills. All the meat's fresh, like it'd been just bought to keep up the illusion once he realised people would search his house, presumably because he saw the people shadowing him. I agree with Conklin that his interests seem off. That browsing history smacks untrue. I mean, I don't know what internet browsing in the late 90s was like, and this is pretty crude, but no porn? Dude's using his fucking birthday as his password, but knows how to hide his porn browsing from... who? He lives alone. Or he's not interested, but that strikes me as more unlikely than it being a sham.