Do you mean a buyer has opened a case through Ebay saying they have not received their purchase?
As long as you have tracking which confirms delivery, and you added the tracking when you sent the item and before the case was opened, Ebay should close the case in your favour.
"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)
