Goo does that sometimes, when it goes down. It's weird.
If you get one now, however... it's legit. I've just updated the OP. Thank you for being so patient.
Derek - Team Carbon Co-Founder
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Please direct questions to XDA or our Google+ community for other users to answer, or our IRC channel. I cannot answer PMs or even read most of them. Use the search button or our many resources for talking to other users and our devs instead.