I am hoping that he will come back and deliver the package separately but either way I think I will be having a conversation with the manager about the drivers scanning packages as delivered before they leave the PO.
I had a mailman, when he was too busy, or the day was too long, he’d mark stuff delivered but not actually finish his route. It would be in my mail box the next day. He did that twice and I called my post office each time telling them I got it the day after it was scanned delivered. Needless to say I had a new mailman soon after…
Wait till end of day Monday see if it shows up, otherwise call/visit your local post office/postmaster with tracking number and they can normally “see” (GPS) where it was scanned as delivered
Ebay will proceed to refund your buyer whether you actually received the return or not.
There is a lot of false delivery addresses scamming going on on Ebay, with orders and returns. You will need to discuss where the delivery occurred with your PO and that the GPS data on the scan says. Don’t rush to dump on the driver, yet.
In our area, FEDEX Ground is the big offender in scanning days before delivery occurs.