I bought a 1 oz. Silver Bullion Bar in Nov. 2024. The price of silver has risen, so I went to sell it at a local pawn shop and it appears the item is a worthless counterfeit. I've tried the automated self help, and the seller isn't responding. Am I out of luck? Or can I get my Money Back Guarantee through Ebay/PayPal?

Too late to file on ebay, but you should be able to file for a refund through PayPal or your credit card company. Do it now!