permanent until dropped weapons (at least some) do not prevent corpse disappearance =[
Most items in Skyrim may be easily lost if placed into a respawning container, left on a body of an NPC or sold to a vendor. Still, some rare items persist in the world of Skyrim, and may even prevent corpses from disappearing. The latter quality is actually useful - for it allows accumulating a decent number of corpses for reanimation via [[Skyrim:Dead Thrall|Dead Thrall]] spell. All persistent items will remain in respawning containers and prevent non-respawning dead bodies from being deleted.</br>
Persistent items are of two distinct types:</br>
#[[Skyrim:Torsten's Skull Key|Torsten's Skull Key]] - only if you do not use it to awaken [[Skyrim:Otar the Mad|Otar the Mad]] (awaken him with shout or rune spell instead);
#[[Skyrim:Specialty_Gear#Guard Equipment|Whiterun guard's armor, shield, helmet, gloves and boots]] - looted from [[Skyrim:Mirmulnir|Mirmulnir]];
More suspected items are listed on the [[Skyrim_talk:Permanent_And_Persistent_Items#Removed_suspected_items|talk page]].