Aldough you are not obligated to point out to the cashier her mistake, if there is a possibility of chillul hasham (they may relize later when checking receipts on the way out) then you have to tell them.
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Aldough you are not obligated to point out to the cashier her mistake, if there is a possibility of chillul hasham (they may relize later when checking receipts on the way out) then you have to tell them.