HOWEVER - I think it goes without saying that when you buy a miner from Bitmain or any miner manufacturer - they are first used to mine then sold as they roll in their newest generation miners for themselves. Their business model depends on that.
This is not true of every manufacturer. I've seen no evidence of Spondoolies-Tech pre-mining with the equipment they sell. If you check their thread I'm pretty sure there is no mention of dusty fans or cases full of dust. Perhaps its a first, I too had some bitmain kit with dusty fans. Also a couple of Dragon miners with dusty fans.
Also the Oct/Nov KNC Jupiters I purchased new were not pre-mined on either.