RX 480 cards have been mostly out of stock for a long time now, so there's a chance that the rig was used for more than 2 months (that's of course if you don't know the guy personally and not sure whether he's telling the truth). You might also want to find out whether it's 1060/3 or 1060/6 cards (3 gb or 6 gb) and 480/4 or 480/8. If it's 1060/6 and 480/8 then it's not a bad deal, but if it's 1060/3 and 480/4.. well, it's still alright, but not that good.