Eridian Manufacturer disappeared from wall

I had put my Eridian Manufacturer gun on the heavy wall display, and then I joined a friend’s game for awhile. Told my friend I would spawn him some guns when we finished. When we returned to sanctuary, i noticed that it was missing from my wall display, and after checking my safe I realized that it has just disappeared completely. And before anyone says it, no I didn’t sell it. Has anyone else had this problem? I put it on the wall because I had lost some loot from the safe…and this was the ONE gun I didn’t want to lose! Very upset