Perhaps; the other two show fogging along the outer edge of the rebate. The only way I can figure that could happen is out of the holder. I doubt light can pipe that far under the film rail.
If you have a collection of negatives that show a progression in the degree of fogging (all at the same end), then the worst was on the top of the stack and the least at the bottom when they got light-struck. The anti-halation layer provides some protection for the lower sheets of film.
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