So after doing a ton of other things and avoiding most main quest things, I decide it's time to do Diplomatic Immunity. I don't know what happened, I have Malbern my legendary, enchanted dragonbone armor, my legendary, enchanted dragonbone Warhammer... Few other things, everything's great. I go to do the quest, and the chest you get your stuff from quirks out and my stuff disappears. I figure "fine, I'll load an old save". Well, I do, but the oldest save I had at that point was after meeting Malbern, before giving the rest of my stuff to Delphine. I'm still there, naked from giving him my armor, but as I'm about to put on my party clothes... There's my armor and weapon right in my inventory. I ended up taking it NOTHING. I tried so many different ways to do it. Magic wasn't really an option because I never use it, and my magika is still at 100. I ended up mostly running past the guards to get to the next door. I did kill a soldier with a soul tear and stole their armor, but light armor isn't much against thalmor wizards. The interrogator dude thankfully also fell to soul tear and I somehow actually survived this quest with NONE of my gear