Indeed these Inactive listings are now Expired! As Bethie hinted at above, they do have a life length.
To save time listing similar items in your shop, we suggest using the copy function on your listing page. If you want to copy an active listing, click Your Shop > Listing and the "Active" tab. Then click the "Copy" link to the right of the listing's section.
If you want to copy a sold listing, click Your Shop > Sold Orders and then click the "Copy" link under the order information.
You can also copy a listing straight from the listing or transaction page in your public shop. When viewing this page, a set of "Listing Tools" will appear at the top of the page. Click the "Copy" link to access the copy function. As the shop owner, these links are only visible to you when you're signed into your Etsy account. For more information on copying listings, please visit: www.etsy.com/help/article/353
Hope this helps!