That's odd because I just got a pair of CX 300 II's in the "fake" box, but they passed both the pouch and the v-grove tests. Most importantly, they passed the sound test, they sound very bassy and they isolate noise (can't hear any outside noise at all even in low volume). If the ones I got are indeed fake, they're probably the best fakes I've ever heard

(would still get a refund on them if I get definitive proof that they're fake though)