I have every single item listed except for the Vvardenfell furnishings and the new dungeon mushrooms. I've looted thousands of chests/lockboxes/nodes in Vvardenfell, and to-date, have found just the Velothi Triptych, Waterfall. Given that ridiculous drop-rate, I don't waste my time there anymore.
Thank you Mix!
I picked up one cold harbor glow stock from harvesting rubywood. After a year of farming that matches my athereal dust collection, but it's out there.
Also the Sixth House banner from Forgotten Wastes, drops from mobs and containers.