I'd be willing to bet that every grading company has graded a trimmed or sheet cut card at some time. It's nearly impossible to be perfect. The 3 primary companies are the big 3 because they get it right nearly every time.
If a card is cut from a sheet using the same sort of equipment that was used when new it would be very hard to tell. You'd have to base an opinion on aging of the exposed edge. And that's inconsistent from one card to the next. I bought a 40X magnifier recently, and have been looking at all sorts of stuff out of curiosity, including cards I know aren't trimmed because I bought them new. (Anyone else do that? get a new toy and examine practically the whole house at 40x or by blacklight or whatever?)
If they knew the cards were cut from a sheet and still graded them that's a different matter entirely.
Steve B
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