A credit card holder uses a Price Protection program (for instance, Citi Price Rewind) commonly found with many credit cards and is refunded an amount for a drop in the purchased item's price.
Later, a defect is found in the item, and the item is returned and refunded. Therefore, the benefit for the price drop is unwarranted, because the original item was refunded.
If the benefit is mistakenly not reversed (to the benefit of the credit card holder), is the holder legally obligated to notify the issuer?
Documents: The credit card agreement does not state anything about this circumstance. The price protection is a "complementary service"; it's provided at the discretion of the credit card company, and neither it's guide of use, faq, nor terms appear to place any relevant burdens on the holder as conditions for use.