I've bought from all over, and I always insist on a few things, thanks to one fella
trying to rip me off.
At least;
I like to get a phone number, full name, additional email address, home address etc. and always ask for additional photo's (think hostage photo's

) to make sure they haven't pulled the photo from the net somewhere.
Sometimes I'll test this info, by calling the seller,
with their timezone in mind of course.

Buying from a seller with good (or lots of) feedback is usually a good move too, but not a guarantee, so still be wary!
If anyone refuses to give me personal info, gets cagey about questions, and if I can't call them;
I refuse to send them money. There's always gonna be another deal