They've been doing this forever. If anyone is into records, they've seen a lot of punched holes usually through the top of the corner. I've seen them on jewel cases also, but it's the first i've heard of them on a game. Sometimes it's not a hole, but a slit like someone took it to the edge of a grinder.
I've seen them used on discounted items, promos, and non-returnable stuff. It usually means for whatever reason, this item shouldn't be traded, returned or whatever.
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