At the southern most point of the Shivering Isles, south of Madgod's Beet, is a cave called Corpserot Prison. Inside at the very beginning of the cave, you will find the evidence chest. It is in both Mania and Dementia. Note: On your map, Corpserot Prison is called Corpserot Passage.
Somewhere near Dunroot Burrow upon a hilltop are a couple slabs of stone. On those slabs of stone is a dead person, with a Potion of Nighteye nearby, some skeletons, and a note. The note is called "Death Decree". Pick it up and read it. It says that a man named "Robert Wisnewski" was sentenced to death by Sheogorath. Robert Wisnewski is on the Bethesda staff list. The reason for his death sentence was for trying to grow a beard (in which you cannot have a beard except for Sheogorath in Elder Scrolls).
In Bliss, there is an Argonian named Big Head. Big Head's quest is to find The Fork of Horripilation. In The Elder Scrolls 3: Morrowind, there is an Argonian that lives on the island farthest to the northwest of the Sheograth Region. In Morrowind, sitting on Big Head's table is The Fork of Horripilation.