new to me n6 Motorola confidential property... topic

So I just got a nexus 6 on Craigslist and it says Motorola confidential property: not for sale. I tried activating it on Verizon but all I get is voice calls because it is Sim locked to at&t. I tried to get the unlock code from them but they said the phone doesn't exist. Currently I'm waiting for a third party to get the code but I have a feeling they will fail. Any ideas?

I attached a photo with the m in the top corner so you know it's real.

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