DarrkPhoenix: The caves with dead NPCs are a part of the mechanics of Gothic 2 and how it handles moving NPCs between locations. When an NPC is moved between zones the original NPC is killed and moved to one of the caves while a new NPC is spawned in the new zone. There's three such caves in the game (one for each main area)- one in Khorinis, one in the Valley of Mines, and one in Jharkendar. So basically what you found wasn't an oversight, but a game mechanic that was turned into an Easter-egg.
I was under the impression that they all went behind the fence when moved. It didn't occur to me that there could be a cave in each section. Shouldn't the other moved NPCs be there too? Interesting that you can take everything from the body of the dead/not really NPC though.
