I have started the "Under Saarthal" quest and once I remove the amulet from the door and get trapped, it does not show up in my inventory. I have re-loaded several times with no luck. In one case I even reloaded to the start of entering the quest and then went off and completed other quests and sold stuff etc. but when I returned to the quest, the same issue occurred at the exact same point. Again, I have reloaded but to no avail. I have confirmed that I am not looking for the wrong item, it is simply not in my inventory. This issue is preventing me from progressing the Mage's and Forbidden Legend questlines. Any ideas?