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Essentially, when you provide your driver's license to complete a return, TRE keeps a record of it and marks which stores you have returned to, the date and time of each return, whether the return involved a receipt or not, and the overall dollar amount.

If you return a product to Sephora and have a copy of your receipt, you're golden. But if you return a product without a receipt (for an exchange), that's when your information gets sent to TRE as a precautionary measure.