The owner of the uncut sheets was kind enough to send me scans. While they’re not the highest resolution, they do confirm that they were all printed on offset printers like real Pokemon cards.
Therefore they also have no dot matrix to confirm age, but they do have rosette patterns that are indicative of real Pokemon cards.
The black text layer is also crisp and clearly a separate vector layer from the rest of the raster layer of the card, meaning it was printed off a digital file directly onto the paper instead of being photocopied in some way
All sheets have similar qualities, including the Shining Magikarp and Gyarados with fanclub embossed treatments
The Shining sheet has the old card back as well (though misaligned) and everything looks good there
The only way this sheet would be “fake” is if someone had the original digital files for this and printed it out on an offset printing press. While that is not impossible, at that point it’s less of a “fake” and more of an unauthorized reprint.
I also suspect if someone had access to the original digital print files for the cards on these sheets, they would’ve printed out more of the very coveted Snap Pikachu. There are multiple buyers who would pay a lot for that card and it isn’t holo, making it fairly straightforward to print. However we have only seen one sell publicly.
One last check would require both a real snap card, the sheet, and a microscope. Then you could check the specific rosette patterns at a high resolution and see if they match.
