Definitely fake. I can remember reading specifically (might have been on head-fi, but can't find it through searching) that if it comes without a carry case it's fake as Sennheiser has never supplied them without the carry cases.'
EDIT - Found this:
eBay.co.uk Guides - Fake Sennhieser PX100 and PX200 headphones. How to spot
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Headphones/IEMs: PX100 (earpads butchered), AD700, iM716 (cable murdered), HD600, Proline 750 (sold), ER-4P/S
DAPs: Xclef HD-500 (sold), iRiver H320, Creative Zen 4gb (sold), Cowon D2 (sold), Sansa Fuze, Apple iPod 5.5G 80GB
Amps/DAC: MisterX Minił, FiiO E3, FiiO E5, audio-dg Compass
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