It's possible to stretch just the corner, then trim to sharp. A bit more subtle than stretching the whole card. And the middle of the edge will be original.
But everything has its clues, and with just doing the corners they'll be thinner than the rest of the card.
What I wonder about are cards kept in one of the original hard holder types, pre screwdown, which was a folded piece of plexiglass. Those gripped the card at one end, so if only 2 corners are thinner and tapered It might actually be Ok, but still get rejected. I'd have to know much more about what the graders are trained to look for.
Steve B
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