Something still seems odd here. He must have known the scammers in one way or another to order a prototype unit. And he's very defensive about it, shifting blame. He may be a victim, but the victim is not cooperating very much to reveal information about how they obtained these units and whether they actually exist. At least some people ordered the units because he said he actually had one, regardless of how badly it worked.

If we're getting the police involved, they should talk to this guy first. It seems he is the closest to the scammers here. He may not have been part of the scam but may lead police to the scammers. Even if they sold half of their dwarfminers, 2500 units, that's still about a $2 million theft at BTC prices middle of June.