Occasionally, an auction gets archived prematurely. To "unarchive" an auction follow these steps:
1. From your dashboard head to the auctions page, then select Archived auctions.
2. Select the auction you wish to "unarchive".
3. Go to Settings, then Advanced near the top of the page. Scroll down to the "Archive" section, click the dropdown to select No and remember to click Save.
That's it! Your auction should now show under Previous auctions.