This is why i just bit the bullet and bought a brand new card as any card from ebay could be mined on and there's no way to tell unless the seller is honest about it. Second hand prices are not enough of a saving for the risk of buying a card that has been overclocked and run 24/7 at too high a temp for months imo. Although in your case the buyer seems honest as he admitted it had been mined on in the first case, when he could have lied.
According to who? (you presumably) if you mean to say 'hardly used' ... Then you can use the phase 'hardly used' ...... 'as new' is a reflection of mostly cosmetic condition.
Mined on for weeks is not in my mind "as new" for a computer item where cosmetic condition is hardly a consideration... Initially I was going to give a silly reply to op along the lines of so what... But now I'm with him, an as new graphics card is barely used .. Or never used .. A mined on one is "used'.. Almost all computer components could be sold as" as new" but as new in computer terms suggests to me little or no usage.. (since cosmetic condition is not really likley to chance)
Realistically they are interchangeable in real life.But yet there is still the term 'barely used' for thoose who don't want abiguity.....by using another term they think should mean barely used.
Something can also have been (genuinely) barely used but not be 'as new' say a computer component scratched as it was installed before not being used much. ...
It almost as though the two phases don't mean the same thing.....