eBay and your seller aren't here and won't see this - we are members like you.
eBay Money Back Guarantee covers non-delivery of your order if you open a refund request within 30 days of the 'latest estimated delivery date' - which was Dec 3 according to your screenshot.
Did you open any refund case from your Purchase History? If not, it's too late to do that on eBay, you will have to go to your payment source and open a claim there instead - PayPal or your credit card.
