The seller is not responding to my TXTs anymore. I don't think he has the serial number as he said he doesn't have the box and this was his roommates. I think my desire to get the Echo got the better of me and I failed to notice the signs that should've told me to back out of the deal.
I don't think the seller started with the intent to con me (did list phone number and we met at his work), but once he realized the device may not work he disappeared.
So I think my best hope is to figure out the SN of the device some how and go from there. But it just feels so frustrating that Amazon would choose to hide this information on a device that's so locked down. This makes no sense.
I spoke with 3 amazon reps. The first 2 was helpful, but that's before the seller disappeared on me. 1st one suggested I contact the seller and ask them to remove the device from their account or give me the SN. After I failed to get that info from the seller, the 2nd rep told me if I have the owner's name/address, perhaps they can look it up. After failing to get this info from the seller, the 3rd rep basically told me they need the SN and can't do anything without it. This is when I offered to send the device in, and he said he doesn't even know how to respond to that (I guess I must've been the first idiot that suggested this idea haha).
My gut feeling is that Amazon would be able to retrieve this serial number from the device, but as an individual user, I am SOL.