Screw down damage to corners. In this case, the screw down itself is not to blame. It came to us in a non recessed screw down, and whoever originally put it in put in unevenly at first, and tightened the screw down on the card itself. Leading to two very deep indentations in the left side corners. They then apparently decided that was a bad idea (correct) but then moved it so far over to the right (which is how we found it) that when they tightened those screws down, they put a notch in the upper right corner.