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hankronI should add that once a seller lies significantly to the buyer about grade, authenticity, trimming, etc., the buyer is no longer under obligation to buy the item. Especially when it involves an expensive item. And yes, a seller can lie by omission.
So if he gives a pile of b.s. about why he got the card graded by PGS (and he will), you should feel no remorse about aborting the deal.