We know from failed bids that he paid more than $675.
Can you give a link to where it says he paid more than $675 please? The only definite bid price I could find was $403 from one bidder. I could not find definite bid prices from any of the other bidders.
AFAIK there are no links to the amount of the winning bid as it has not been announced. Anyone that says otherwise is simply spreading rumors.