basically placed a few legendary weapons on the weapon display racks above the enchanting table in the manour , went away did a few quests over 3 hours came back

Mehrunes razor

spellbreaker shield

dawnbreaker

are now GONE!

::: sigh::: ....gottabekiddingme

Use a previous save file.
You do keep back-ups every few hours... right?

I've never had weapons re-appear for me... although I've only had this happen once to me.