I was on Talir's short wererat quest, when suddenly potions appeared in my inventory. In stack of four, I had potions such as haste, displacement, crimson, discipline, blur, shield, 10 cure serious wounds, etc.
These very much seem like the typical stacks of rewards, though Talir never gave them to me.
(Yes, they were trashed.)
(No, I wasn't doing anything in particular but walking at that moment)