Just got those and trying them out. The sound is really good if I finally find a fit..
because damn those are hard to properly fit into my ears, it seems my left ear is no problem at all, I snap it in quite easily, but my right ear...
Isn't the best solution to call Sennheiser and just ask? I mean if you bought this stuff as fake's, they also ought to know.
Don't know about their CS, but maybe they can also help if it turns out they are fake.
Just a suggestion. :)