In the HH_DisguisedArmor quest ("Orphan of Arnesia"), Nileno Dorvayn only recognizes Neminda's death if there's no Neminda's orders in player's inventory. The obvious case where player takes them from her body after she attacks him for not wearing the helm, is ignored.
(She also won't accept orders if player chooses to steal them from Neminda rather than obtain by disguise - if he lost the helm but doesn't want to surrender the quest, for example. If the player *does* find the helm afterwards and talks to Neminda, there will be two copies of orders.)