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PaulIf you take the article at face value, it is crystal clear. Mastro "confirmed" that the Gretzky Wagner was cut from a sheet. That means that Mastro either saw it being cut from a sheet, or had other proof that he felt was reliable -- perhaps the word of the person who cut it from the sheet. The only "opinion" offered in the article by Mastro is that none of the Piedmont back Wagners were ever publicly released.
So, it seems pretty clear to me that there are only three possibilities: (1) the card was cut from a sheet, (2) Mastro was relying upon bad information and the card was not cut from a sheet, or (3) SCD's writer misconstrued what Mastro said. It would be interesting to hear from Mastro himself on this.