Refunds and returns

Hi. A customer returned an item to Amazon – Amazon gives them a full refund. Then sends us an email saying the item is unsellable so I get the item sent back to me to examine. The product is damaged and there are parts missing from this that the customer has sent it back like this. What can I do? Do I complain to seller central that the buyer has returned damaged product and will I be reimbursed for this?