I cannot infiltrate the Thalmor Party because I cannot drop all of my weapons off with Delphine. I picked up some knife in a chest on a quest to gain a word of power after killing a Lich called Valcun(sp) and then I found a knife in the chest of that dungeon that must be part of another quest line because I cannot drop it. Do I have to go back to a previous save and finish Diplomatic Immunity on the main quest line first and then re-do the whole Valcun dungeon?