They might be Unissued but they did not do well in storage.  Whatever waterproofing they had on them, has melted inside. 

If you like your gaiters to come with a layer of goo that gets on your pants, shoes, and socks.  Then get these.  

I suppose you could clean them and then re-treat them for waterproofing with a silicone spray.  By all means, be our guest.