Chest 1 (Semi auto pistol element)
In the tent, opposite the path down into the lower location.
Chest 2 (Modding tools)
Out in the yard, right after you enter through the gate that is barred with an obstacle.
Chest 3 (Element of a machine gun)
Return here, once you get the lockpick. From the Remnant Bazaar go up a little, the chest is close to the next tent. You need to have a lockpick to open that.
Chest with coins 1
The chest is closest to the monolith and the camp. You only need to climb down the stairs.
Chest with coins 2
On the hillock, a bit off the Remnant Bazaar.
Chest with coins 3
from Tower Courtyard, walk over to a larger chamber, where you find a descent into the catacombs. Follow the corridor and, at the end, you find a hole in the wall. Right across the hole, you find the buried chest.
During your meeting with Jacob and Sofia, during the mission and while unlocking the passage to the catacombs. You find the mural after you jump down on the wall to your left.