Hey my Skyrim loving people.. I need some help. I can't seem to figure out who has this key to the empty cabin over on the island. It's south of the Miraak's temple located on a nice snow covered hill. Real cute little cabin and it says needs a key to open? Also how do you get rid of the black books from inventory when you are finished with that part of the game, I am playing now on PC so if there is a short cut way of dumping them let me know please???

The Thalmor own that Cabin, and do not appear until a Quest in the Skaal Village to save the Blacksmith.

Black Books are with a character forever, I do not know if a Mod exists to remove them.