Probably depends on which auction house is the major auction house that did the contacting. Keep in mind that PSA and at least one major auction house are owned by the same parent company.
So I suppose it’s possible that they might share information about cards recently graded by PSA with the auction house.
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Trying to wrap up my master mays set, with just a few left:
1963 Post complete panel
1968 American Oil left side
1971 Bazooka numbered complete panel
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