Well, if you hadn't bought them someone else would have. That's about all the condolence I can offer.
I might have bought them, depends on my mood really. It's likely I would have just told him flat out that I thought they were stolen and then left.
I mean, come on, the dude supposedly brought the stuff all the way from Florida, but doesn't even know much about it?
Anyway, don't be surprised you find your new wheels and/or bike u-locked with someone else's lock in the future, with an angry biker or hipster ready to jump you.