This guide will tell you how to find the Downtown Post Office Key location in DMZ Warzone 2.
First, you have to boot up your game, and you will find the downtown post office location on the map indicated by a Letter icon. Open the map and click on that letter icon.
You will find this in the Hazard zone. And you will find a secure room on the 2nd level. Then you have to enter the F4 building, and you will find the downtown post office door there.
