My understanding is that Topps cards, which are "guillotine cut" have a very slight slant to the cut front to back..hand cutting or even professional cutting almost always results in an up and down cut...it would likely be identifiable under close magnification and scrutiny. I would say, however, very likely the deciding factor would be who sent it to the grading company.
That said, sheets are generally very cumbersome to collect and display.
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