If the tracking on the carrier's website still shows out for delivery, then you should perhaps direct your question to the carrier.
Hopefully, it will get updated and Ebay will release your funds.
Even if you contact Ebay, they will only accept proof of delivery from the carrier.
Once the tracking is updated to 'delivered' your funds will be released after 48 hours.
"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)