Euhemeria Lighthouse Camp (Location)
A military outpost in Faiyum. You'll come through here on your main quest search for the Crocodile
The lone treasure here is just by the captain's tent. So is the captain, usually.
His tent does have a backflap, but the camp is so small that even this covert approach is likely to be spotted. Better to snipe your way through here, if you've been upgrading your quiver, or go loud by detonating the oil jars near the campfire, and mopping up survivors. Either way, once everyone's dead, you can loot the large red chest in the captain's tent for location completion.