As long as you sent using the Ebay Simple Delivery label, if the buyer opens a return stating the item arrived damaged, Ebay will deal with the case and refund the buyer while you keep the payment you received.
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)