There are 5 types of skeletons.
Skeleton: EditThis is the skeleton you will get when you search a skeleton with loot.
- Grave x1
- Survival +10
Human skeleton: EditFound in most buildings.
Officer's skeleton: EditFound in police departments, sometimes on streets.
Solider's skeleton: EditFound only in military bases.
Bandit's skeleton: EditFound when raiding bandit bases.
For the loot see here.
??? skeleton: Edit
Found in hunting shops and sometimes intact houses.