Apparently, after I beat Bolvyn Vemin in the arena, I decided to take one (Just one!) piece of Armor from his corpse, as I couldn't carry everthing he had on him. I'm aware that this is dishonorable but w/e.
Anyway, I return to Ald'ruhn, head to Sarethi Manor, only to be told that the Redoran Council is very dissapointed in me, blah blah blah, return all of his items to his wife.
Problem? Bolvyn Vemin's corpse vanished after I left the cell. Now, Is any of this even vanilla? (I run a modded game after all) If so, how can I skip by this?

This is not from the vanilla game - as far as I am aware. You can get round it on the console, was your duel for Hortator or Archmaster?

EDIT: I'll start a new topic in the mod fourm, as I'm positive LGNPC is causing this.

Ok - continued here.

http://www.gamesas.com/bgsforums/index.php?showtopic=1063745