[Pibben]

I have a pair of QC2:s that I suspect are fake. Does anyone of you know how to tell fake ones from real?

 

[majestic12]

Where did you get them?  The easiest way to verify (if you bought them new) is to contact Bose and ask:
 
http://www.bose.com/controller?url=/customer_service/privacy/be_sure.jsp
 
There's a whole website dedicated to fake headphones as well if you need more information.  Google it!