Refer to picture if needed.
Location 1 (White Chest)
This chest is in the first area before fighting Knoxx-Trap. It is located on the stone path under the two paths overhead.
Location 2 (Red Chest)
This chest is just after killing Knoxx-Trap. Head outside to the area where you encounter two claptraps. The chest is in front of a Jakobs house cut-out.
Location 3 (White Chest)
After the Red Chest, take one of the two paths on the right. The chest is about halfway down the path. Watch out for Rakk-Traps. There is another white chest on the ledge to the left just after chest number 3.
Location 4 (Red Chest)
This chest is located just outside the area where you fight Undead Ned-Trap.
Location 5 (Red Chest & White Chest)
These chests are by the vending machine right before entering the Steele-Trap area. To open the metal panels, you must shoot each cut-out along the way. If you miss a cut-out, you can shoot the target posters.
Location 6 (Red Chest)
The chest is located just outside the Steele-Trap area. It is by the vending machines.