Here are the quests in the Seyda Neen town. Fargoth's Ring is already done, so that isn't included. I did:
Death of a Taxman
Fargoth's Hiding Place
However, the Hiding Place quest still needs somebody to script Fargoth walking over to the stump and placing his items into it. That kind of code is beyond me at this point. I did try to script the stump to add in the items but supposedly Skyrim doesn't allow container objects to use the AddItem() function. Looking at the Dawnbreaker scripts, an Alias to a Location Reference is used. It seems really complicated just to add 3 items to 1 container.
So until that code can be added, this quest will stop at stage 30 and won't complete.