i second this use escrow for everything that involves money no matter, 1.6k USD is overly suspicious especially now that the price of btc is skyrocketing.
Definitely get photos, One cautionary tale in regards to these pop up sales of a large number of miners.
We got ripped off about a month ago. The scam wasn't to get a full BTC amount from us; atleast not in the end, they settled for the prepaid shipping which we sent along. In total they may have made a couple hundred USD.
Escrow saved us the total amount, but we should have dug deeper and gotten the answer to the questions already asked.