If your current listing has ended (for any reason what-so-ever), you've gotten the eBay marketplace item ID for your listing and you're trying to view/ locate the original listing on eBay, follow these steps below:
Step 1: Access the listing web page
URL: eBay.com/itm/ebay-item-id [replace the ebay-item-id with eBay marketplace item ID]
You'll see a dialogue box with message "The listing you're looking for has ended".
Right near that message, you'll find a View original item button
[Refer to image below].
Click that button and you'll be re-directed to the original listing's page.