Awhile back I bought the Hjerim house in Windhelm for the quest about the butcher guy. After I finished the quest I bought the armoury decoration from Jarleif and filled the racks and manikens with my stuff. The left over armour I put in one of the chests in the rooms upstairs (I can't remember which one) and didn't really go back in. One of the things that I put in the chest was the dragon mask Nakriin.
Awhile later I found the wooden mask in the Labyrinthian and went back to get the mask to put on the bust but when I went to the bedroom all that was there was a chest. Before there was also a double bed and a wardrobe. I'm pretty sure I put it in the wardrobe but I'm not sure. I checked every chest in the house trying to find it but now I can't. I think maybe it might be because I had my wife and two kids stay there for a while.
Can anybody tell me what could of happened?