Usually only two decks are used at a table, one for the current hand, and one in the shuffle machine. That's only 104 unique tags. Decks tend to be changed ou

Usually only two decks are used at a table, one for the current hand, and one in the shuffle machine. That's only 104 unique tags. Decks tend to be changed out only every few hours at most, because it delays the game (new decks are visually verified by spreading them on the table to see that they contain every card).