Can I leave my crap weapons, armor, items such and such around Castle Volkihar without it all mysteriously disappearing? I'm just double-checking because I plan to move my collection of daedric artifacts to the castle and would pain me greatly to lose them.

Best way to test if it's safe make a enchanted sword named "check" place it in a container or weapon rack comeback after a week or so if its their its safe. Also from my experience it is safe