After much back and forth with this individual or individuals, based on some inconsistencies in dialogue, it is my strong gut feel that this is a scam. Make your own decisions but I wouldn't touch this situation. Likely a couple of "resellers" that bought a bunch of miners for $2700 plus PSU's from Bitmain and now they're screwed and can't get rid of them. So they cooked up this plan to escrow 1 or 2 machines and then try and get a chunk of money for the rest and run. Rinse and repeat. Beware.
Inconsistencies such as?
You can draw any conclusion you want, doesn't make any of it factual. I'm not a reseller, I don't have a partner, and I'm not screwed if I can't sell them. I would prefer to get rid of them, but if I can't make a deal then it's not the end of the world.
Yes this is clever scam more advanced
1) price is more or less real
2) He even have stock pics look real
3) offer couple units escrow
4) Gain little bit trust take big chunk and run away
@ OP you didn't answer why you sell in first place why order from bitmain and then sell immediately at loss? You didn't think about hosting solution before order