You will always be able to find details of the order in your Purchase History in the drop down menu at top right, however, ebay only gives members 30 days to file an Item Not Received (INR) case. After that, you are covered by paypal for 180 days. So go to paypal and look among your Account Activity to find the transaction and open an INR case in their Resolution Centre. DO NOT ACCEPT AN OFFER FOR REPLACEMENT. It is likely a stall tactic and will not come in time, you will lose your refund request.
And, please, don't let the experience with one seller cloud your feelings about the rest of us.
Best of luck to you.