A friend of mine just bought pink Brain Attack Stormer's helmet. He found it in lot of parts which were rejects from Lego factory. Sadly, I don't have any knowledge about Hero Factory collectibles, so I hope to find HF experts here :D. Anyone know if this part is one of a kind or maybe more of them exist? And is it prototype or misprint rejected from production? And how much it could be worth? Friend said that if price will be good enough, he may consider selling it.
Here are more detailed pics:
Part has "© 2012 LEGO" and part number on it and it comes from trusted source.