Do you mean you have proof of delivery?
Enter the tracking details into the carrier's website to confirm delivery.
Ebay may sometimes take a little while to 'catch up' - they don't instantly show an item as delivered even though the carrier's website might confirm this.
Ebay will release your funds 48 hours after delivery is confirmed.
So, if the carrier's website shows delivery, AND more than 48 hours have passed, you can contact Ebay Customer Services and ask them to release your funds.
"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)