Hi-Polymer Eraser...
These were just simply erased with a hi-polymer white eraser. I'm certain. Look at the fading along the edges of the remaining images. That's from the eraser. It's possible to erase the ink off a card right down to the clay-coat white stock beneath. I used to do it when I was a kid so I could re-color the hats for guys who got traded to new teams.
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