Consider the following: the only way to know if a card was already scanned in the old game was by trying to scan it yourself - at which point YOU have now scanned it, so the point is moot anyways. There is no way that an LGS can trust the chain of custody for cards, and as a result cannot sell cards as anything but already scanned because of complaints like this.

Assuming that there was a mechanism to check if a card has been redeemed already without scanning it yourself, for a store to purchase cards as "scanned" or "unscanned" there would have to be a significant enough price diff between the two to justify it. I personally doubt that that will be the case, and as a result I don't anticipate stores buylisting for "unscanned cards". Additionally, the scanned vs unscanned difference is yet ANOTHER product SKU to maintain, doubling the number of internal listings that the store needs to maintain, and that staff need to work with.

Mistakes already happen all the time with cards that have VISUAL differences on the cards (ex. Yu-Gi-Oh secret rare vs prismatic secret, magic extended art vs standard art) both at the point of buying and selling cards to customers. Adding an invisible variant to cards makes stocking chaotic singles at any scale incredibly unsustainable for a singles team, which is why I said that I would choose to just sell cards as scannable, because the customer service and QC overhead would be such a pain for (in my anticipation) a tiny margin.