If they could be bent then they were not adequately packaged. They should have been sandwiched between two pieces of board strong enough not to be bent. While you can ask a buyer to take the item and packaging to the PO it is extremely rare that AP will accept any responsibility unless the packaging is ripped to pieces or there are tyre tracks showing it has been run over.

If it were me I would either send a replacement or a refund, whichever was more cost effective, and put it down as a customer service expense exactly as I would if a buyer said an item with no tracking to their exact address hadn't arrived. I have a few cents built into the cost of every item I sell which more than covers the occasional refund or replacement without return.