Handshake doesn’t usually have the longest tasks to complete in Gray Zone Warfare. He wants you to finish a task, get paid, and move on to the next one. That’s different for Hazardous Treasures, where you have to find multiple containers.
Hazardous Treasures Task Guide (All Parts) – Gray Zone Warfare
These containers are scattered around the map and you will need to return to the main base to consistently drop them. These containers are heavy and will take up a lot of your inventory space. When picking them up in Gray Zone Warfare, make sure you have a clear line of sight to your nearest landing zone to proceed to the next one.
There are six containers that you need to track down in Gray Zone Warfare. The first one is in the Sawmill. The next one is in Blue Lagoon, and then you go to Hunter's Paradise, Ban Pa, Pha Lang Airfield, and finally, the last one is in the YBL-1 Bunker. You should focus on the one in the Sawmill first, which introduces the mechanics for this quest. It's much more complicated than Wanted Man or UNLRA quests.
When you reach the Sawmill, you will first need to clear out 10 NPCs that are wandering around the area. These can be any NPCs you come across and they aren’t the most formidable fighters you can find in Gray Zone Warfare, so you should be able to make quick work of them. After those are cleared out, the container in the office building with a locked door is found.
