Maybe one way to prevent people from reusing labels is to have an expiration date on each card that is graded. If you own a graded card whether you submitted it or not, you would just use some app to scan in the whole slab to register it again. The app would check it against its database to make sure the card matches the original one that was graded. If it does, them the it would extend the expiration date.
It's a far fetched idea but one never knows.
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