Ebay is very pro-buyer lopsided but this is a slam-dunk for the seller as long as tracking shows delivery.
Ebay may not close the case immediately but it will close in your favor.
Note that even if you printed the shipping label through the ebay transaction, in order to win the dispute, it still necessary to copy and paste the tracking number. (In my own cases such as this, in the description part, I've also added "according to USPS tracking number (fill in), the item was delivered on (date) at (time) to (zip code)."