Some of the cases that the cards are in seem to have some white showing along some of the edges, perhaps from being welded together so tight. Look at the scan to make sure the card and the card-case both meet your expectations before purchasing!
Yeah, the welding was so extreme that it knocked the card off-center and took some of the corner off of... uh... each corner!
There are so many grading companies that seem to give just about everything a 10. The big ones (Beckett, PSA among others) are the only ones that matter. All others mean absolutely nothing. You have no clue what their scale is based on. But yeah, that's pretty crazy!
What would not surprise me is if he graded it himself. Had an issue with another guy on Ebay who was making and grading his own cards and trying to pass them off as 10's GEM MINT even though they clearly weren't.