If the casino want they can change the dice. Usually it happens when players begin to win too much. Some casino supervisors are as superstitious as the players.
The exchange is never noticed by the players and the shooter.
But the dice can be changed in other situations:
They find the dice too old and the edges too worn down. This usually happens when there is no action 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. The player himself can ask the casino to change the dice. They will hardly refuse, especially if the player is a high roller. Of course the casino is under no obligation to change the dice just because a player asks. The shooter can lose one of the dice while rolling. 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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