The dice can be changed by the casino at any time. Usually it happens when players begin to win too much. Superstition is common for casino supervisors too.
The exchange is never noticed by the players and the shooter.
The casino can decide to change the dice in any other of the following situations:
They think that the dice are already old and the edges are worn down. The casino change the dice when nobody plays at this very table.
The dice can be changed with every new shift or a crew of dealers. The player himself can ask the casino to change the dice. They will hardly refuse, especially if the player is a high roller. But you have to remember that the casino can refuse you as they are not obliged to do it. One or more are lost when a shooter bounces them off of the table. It's very rare that dice are actually lost.
Note: All dice sets are numbered and usually have the logo of the casino and the city and state location of the casino imprinted. Dice are cancelled after use with a device that imprints a small circle in the centre on the number 4 edge.

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