When drugstore cosmetics are returned back to the store where do they go ? What happens if the?

... product is used but the customer tells the staff that product is not used? Some people test new product to see color and put it back on the shel

... product is used but the customer tells the staff that product is not used? Some people test new product to see color and put it back on the shelf. But when customers realize the product they bought is used, the staff does not know who used the product if they tell the staff it was used when I bought it.

or:... product is used but the customer tells the staff that product is not used? Some people test new product to see color and put it back on the shelf. But when customers realize the product they bought is used, the staff does not know who used the product if they tell the staff it was used when I bought it.

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