Buy Stations are one of the most important aspects of any extraction zone within the COD DMZ mode, but not every map is as obvious as Al Mazrah when it comes to spawns. For areas like Building 21 and the Koschei Complex, there is no map that shows the location of Buy Stations, but they do exist and I found the Complex Bunker spawn myself. Related: COD DMZ Needs a Weapon Stash Reset in Season 4 | GF: I Certainly Agree!
Where to Find the Koschei Complex Buy Station in DMZ
You can find the Koschei Complex Buy Station in the Factory Admin section of the bunker in the DMZ. This is the only station that you can find in the entire area, which makes it more valuable, and more dangerous than stations from standard zones. Reaching the Factory Admin on its own is a process that requires a key.
To get the key to the Factory Admin in DMZ, you have to get past the initial entrance you chose for the Koschei Complex. Once you reach the central Chemical Plant in the dark, you need to head to the central vents. Anytime I look through the vents, I can find at least one Factory Admin Key on the ground. That means you won’t need to rely on any luck.