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HankronA good rule of thumb is to not buy cards in PRO Holders. To say PRO has a checkered past is an undestatement.
As Albie correctly pointed out, someone who owned a Play Ball Greenberg that was actually in Mint condition would have it graded by PSA, SGC or other generally respected grader. Further, if this seller thought he owned a true Mint Greenberg, he would get it graded by PSA or SGC. The reason? A PSA9 example would sell a substantially larger sum of money-- and I don't think that this seller runs his actions as a charity. So, if the seller doesn't beleive that he has a Mint and unaltered Greenberg for auction, neither should the bidders.