Modern Warfare 4 DMZ has plenty of keys for you to find and collect, which can then be used on locked rooms to get unique (randomized) loot. One of the most common keys you might have is the Coin Mining Den Key, which can be used inside a small building in the NuriGO West area of the NuriGO mall. Here's the quick location you need to head to.
Having keys in your inventory is risky, so make sure you carry a Rare Backpack so you can use the Secure Slot to safely keep the key in case another player kills you.
The Counting Room Vault is filled with exciting loot in MW4 DMZ. Here's where you can find it (and how to open it).
The Coin Mining Den can be found inside a small building in the west district of Nurigo Mall, close to the Grid. We've tagged the location on the map above, but you'll find further guidance below.
Once you've located the building shown above, enter the doors and take the stairs up to the third floor. You'll find a locked door on the third floor that you can use the Coin Mining Den Key on, which will allow you to enter and loot up.
Unfortunately, the loot inside isn't very good. While it's likely randomized, I found no Weapon Caches or lockers inside, and mainly just found loot boxes that contained Printer Parts and other items that I could sell for DMZ Cash. There were plenty of server racks if you're short on CPUs and Printed Circuit Boards.
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