there are fakes. but, they are easy to spot, and someone can tell right off the bat. there are tons of gray market stores (stores that resell, and do not have a nike account) that have some releases from co.jp, but prices aren't great. i was in taipei about a month back and SBs are still really dope, so if you are thinking of picking up a few pairs you need to keep in mind only a handful of stores have SB accounts in taiwan.
taiwan doesn't get too many exclusives either, so i guess my advice is to save your money unless its a real dope co.jp.