There are loads of DMZ keys in Call of Duty: Modern Warfare 4. Used to open both locked containers and locked doors, keys are your fast-track to getting your hands on some of the best loot the extraction mode has to offer. However, when you receive a key, you're only given a brief description of where to use it, so we're going to outline where you can use every key the game has to offer.
Here are all the keys we've found in Modern Warfare 4's DMZ mode and where to use them, listed in alphabetical order by the name of the key. Note that this guide is a work-in-progress, so if the key you're looking for isn't listed here, check back soon. The blackmarket weapons locker key can be used in two different locations in Hajin.
Look for the blackmarket weapons store, identifiable by its iron wrought gates and red advert on the roof. One of them is in southern Deadtown, while the other is in eastern Hanrin Village. Go to the basement to find two lockers at each location, so if you have a second blackmarket weapons locker key, it's worth bringing with you.
Along with finding it as loot in Hajin, the coin mining den key can also be obtained by completing the "Operating Shopping Hacks" story mission. It opens a door on the third floor of an otherwise unassuming building directly north of the Netshin Tech Complex and east of the gas station found to the west of the NuriGO Mall. Inside, you'll find a number of lootable containers, including plenty of server racks, which are handy for electronic sensors.
Completing the "Operation Silent Ledger" story mission will net you the counting room vault key, but to use it, you'll need to go back into the casino. Our dedicated guide explains exactly where to go, but briefly, you'll want to take an immediate right-hand turn as you enter through the main entrance then go through the brown door in the following corridor. You'll find a bunch of safes, loose cash, and containers inside.
The executive arms auction key can be used inside the DBN Headquarters building, which is the tallest skyscraper inside The Grid. If you choose the "Operation Shopping Hacks" mission, you'll spawn nearby. This place is highly fortified, so there are loads of enemies around, and to find the locked room, you'll need to use the various elevators and ziplines dotted around to go to the very top floor (but not the roof).
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