The Buyer Protection is the precedent over all sellers wants.
The only safeguard for the Seller is a Bank Transfer or Cash on Collection Payment.
I only sell using this as the Payment Method, a buyer takes a longer time to come forward but I have never not sold.
What I don't do is encourage is the mis-use of the Buyer Protection Scheme that can be put in place.
The methods for a certain type of Buyer to create a mis-use seemingly grows daily.
I suspect from drawing on known of experiences others have had to endure, that your Cart' sent, is not the one being returned, and the Buyer will be remunerated for their efforts along the way.
Ebay has a lot to answer for with this as the too regularly seen outcome of their Protection methods.
The Protection Period strangely, covers period that will enable a Holiday or Refurbishment to take place, the method almost works as a Free Hire Period, or Free Parts Donor Model for a Buyer.
Only a Bank Transfer or Cash on Collection will protect the seller from such a intention for their goods.