You have to think that with a collection of this magnitude, with 30 or 40 of nearly every card, it wouldn't be hard to transpose two cards. Imagine being handed 40 raw Wagners that all look the same and trying to keep them all in order. I'm not giving PSA a free pass, it was a bad mistake on a very prominent card, but it would be pretty easy to get mixed up with this massive group of cards.
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