No doubt he is a scammer. His tail is between his legs. I am contacting GoPro to get them started on who his "mole" was inside, and they can start with the mole and do an internal investigation and then contact the police. These guys think they can run and hide.......
Oh and by the way, I have another reason why you shouldn't do that: You likely received a GoPro (assuming you are not a shill) that was obtained through carding or warranty fraud. In other words, you are now in possession of stolen goods. So, the options are more like:
1. Talk to the police, lose the GoPro, and risk getting convicted of a crime even though you are a do-gooder.
vs.
2. Shut up and hope it wasn't stolen.