The casino has the right to change the dice whenever they feel like it. But in most cases it happens when more players begin to win more. 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. But the casino is not obliged to change the dice only because the player wants it. One or more are lost when a shooter bounces them off of the table.
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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