Sweet Fifteen

First things first, make your way to the Torres Warehouse. It's located southeast of Barriga Town in the Sierra Perdida Region. Once you get there, look for a note on the door – interact with it to kick off the treasure hunt. Then, head inside the warehouse. You'll see a button on a stand, but you can't hit it just yet. You need to find four switches first.

Switch #1: Go into the back left room of the warehouse. You'll need to climb up onto a crate and carefully make your way through the shelves. Eventually, you'll hit some wooden planks blocking your path. Use your melee attack to break them down, and just a little further ahead, you'll find the first switch.

Switch #2: From where you found the first switch, turn around. You should see a ladder nearby. Climb up to the second floor and follow the walkway. Keep going until you reach a fenced-off area – the second switch is waiting for you there.

Switch #3: Head back onto the walkway and make your way to the back left side of the room. From there, drop down onto the roof below. Now, look through the shelves and you'll see a locked door. Shoot the lock to open it. Drop back down to the first floor and take the path on the right side of the room. You'll see some cases and a table; hop along them to reach a button at the end. Interacting with this button will disable an electrical wire, allowing you to access the fenced-off area where the third switch is located, along with some Medicine.

Switch #4: After grabbing the third switch, head up the stairs. Follow the room around, and you'll find the fourth and final switch chilling in the kitchen area.

Once all four switches are activated, head back to the main room where you first saw the button. Interact with it now, and voilà! You'll get the awesome MG42 Light Machine Gun. Plus, the room at the back will unlock, giving you access to Durable Seals, Scrap, and Metal. Nice haul!