I don't really have experience in this at all but I think that if the seller has really good feedback (100% or a lot of positive) and not from southeast Asia (not trying to be racist at all here - lots of bootlegs come from Hong Kong it seems like in particular) then I would say it's probably okay. Otherwise, maybe try seeing if someone on the forums could buy them for you in person from the boutique/counter or online and then ship it to you