That's a good question
Paul,
According to PSA's grading standards:
A PSA Mint 9 is a superb condition card that exhibits only one of the following minor flaws: a very slight wax stain on reverse, a minor printing imperfection or slightly off-white borders. Centering must be approximately 60/40 to 65/35 or better on the front and 90/10 or better on the reverse.
So in theory a minor stratch doesn't influence the grade. However, in practice a card with mint looking corners and a lot of surface wear should throw up red flags to the grader. Four razor sharp corners with some surface wear? No way.
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