There is no way to withhold original shipping price or return shipping price. A customer can just state a seller faulted return reason, without providing proof of damage you can’t charge more than a 19% restocking fee.
I tried waiting it out for Amazon to provide a refund and after 1 week they still had not.
Gave it a few more days and no autorefund.
leave it to amazon to give you a defective template though. I had to fix it so it didn’t abbreviate the order item ID.
Was able to do the 50% restocking fee and no refund on shipping. I was also able to get the manufacturer to send me the missing accessories for free.
The guy probably had an older one where the blinder wore out and figured he could get one for free.