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davidcyclebackObviously, this would be unlikely. A sheet cut card technically grades the same as a trimmed card, so it should be priced the same. If you're pricing the card as trimmed, the story is neither here nor there. If you're placing a premium because you think 'sheet cut' is special, that would probably be unwise. The only way I might consider 'sheet cut' a step above trimmed is if it's extra large.
An uncut sheet would be worth a small fortune. Just think what a 2 card panel would sell for at auction. Net54ers would be slipping in their own drool. The only way someone would cut apart a large sheet in recent years is if he thought he could fool PSA or SGC into giving them 9, 10s or such. If the cards are lower grade, with creases and stains, someone would have to be insane, or really dumb, to cut down a sheet that might be worth, say, $200,000 intact.
In short and as I already said, if you're pricing the card as trimmed, the veracity of the story doesn't matter. If you're pricing the cards as sheet cut and you think sheet cut as worth a lot more than trimmed, then the veracity of the story matters a lot.
To the seller's credit, he has disclosed that the card would only get an authentic grade by the grader due to the modern cut.