To play devil's advocate a bit here...
I have absolutely no clue what this is, but that questionable corner wear (with the obvious assumption that maybe the block was created from an actual old and worn card and isn't an original printing piece) could actually be naturally-occurring wear from the handling of whatever this item is over time.
There are a bunch of other dark areas on the faces and backgrounds where the surface has also been worn away/affected, so it's possibly 'normal.' Just think it's important to note this fact for the benefit of anyone who's investigating the piece.
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