If the casino want they can change the dice. But usually this happens whenever craps players start winning a lot of money. Some casino supervisors are as superstitious as the players.
From a dealer perspective it is amazing to see that when a whole new set of dice are sent out in the middle of a hot roll, the shooter and the players almost never recognize that a new set of (5) dice have been sent out.
The casino can decide to change the dice in any other of the following situations:
They find the dice too old and the edges too worn down. They change the dice when nobody plays at the table.
At the end or beginning of an 8 hour shift, in some casinos, either when a whole new crew of dealers comes on to the table or when the Pit Staff counts down (audits) the Bank. At the request of the a player, especially 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. But in reality it happens very seldom.
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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