[mothered]

Most likely like other automated systems authorizing a return once the label is scanned in by the carrier. A computer realized that your package arrived so they automatically sent out the new one. Hilarious! Great SE.

Pretty poor process from a company's standpoint, but great for the SE'er.

At my work, all packages that're scanned by DHL and FedEx on receipt of delivery, are then Immediately checked by the warehouse to make sure the goods are enclosed. The Item(s) are then placed back In Inventory and a refund/replacement Is Issued thereafter.