We are playing two seperate games of Skyrim. In both of them we have been placing Dragon Claws on display after we have finished using them, (they can be dropped even though they are quest items, at least on the Xbox360). All of them have remained more or less where we dropped them except for the Emerald one. It didn't happen immediately, but after a few weeks of game time it disappeared in both our games. This happened in Markarth, in Vlindrel Hall. They were on display on the hearth in the front room along with the Ivory Claw, which didn't disappear.

Has this happened to anyone else? Did it respawn anywhere else?