If returning a product through the mail, when you send it back always get a delivery confirmation. That way, someone there has to sign for it and cannot dispute you and say they never received it.
DELIVERY confirmations may be tracked because they are scanned at various points along the path of delivery and the carrier scans it at the point of delivery but can leave it if there is no response (depending on customer's normal instructions). SIGNATURE confirmation works the same, up to the point of delivery, then the carrier has to scan it and get a signature so it is always handed over to a person. In either case, thanks for using the USPS!
If you are dealing with a long-established company and they have provided a return mailing label with the invoice, this should not be necessary. I don't bother with Delivery Confirmation on goods to be returned unless it is to an individual (such as an online auction purchase) or a company I don't know much about. It's always a judgement call, however.
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