We all hate it when we need a key to unlock loot caches and areas in ARC Raiders. While exploring the Ruby Residence in the Dam Battlegrounds map, you will get the Blue Confiscation Key. The game won’t tell you much about its purpose.
The key unlocks a locked door to the “confiscated-goods room” inside the tunnel network of the Blue Gate map. The key unlocks a locked door to the “confiscated-goods room” inside the tunnel network of the Blue Gate map.
How to Get Blue Gate Confiscation Key in Arc Raiders

As I mentioned above, the Blue Gate Confiscation Key is found randomly while exploring the Ruby Residence in the Dam Battlegrounds map.
Make your way to the northwestern corner of the map. Ensure that you are searching within the Research and Admin building south of the map. You will find the key to all cabinets, loot crates, or from enemies.
You can sell the key to vendors for 100 credits. Keep in mind that the Blue Gate Confiscation Key takes up one slot in your inventory and cannot be stored in your safe pocket. You can transfer it to your stash and back to your loadout whenever you want.

Where to Use the Blue Gate Confiscation Key in ARC Raiders

The key can be used to unlock one of the doors within the underground tunnels of the Blue Gate map. Go there and visit the Headhouse area within the Checkpoint POI.
You will come across a tunnel system below. Enter it and continue down the stairs to reach a point where you need to use a zipline to get further down.
You will eventually reach the ground. Take a left and continue northwest, and you will find a passage on the left with a weird contraption blocking the way.

Keep going southwest from here until you spot a door on your left with the Mantikor sign on top. Use the key to gain access to the room ahead.
Kill the enemies around here, and you will find weapons, ammo, and supply crates in the room. Some basic weapons, such as the Burletta I Pistol, and a lot of scrap items, such as apricots, cloth, and bandages, can also be found here. A pretty good place for restocking on ammo and some goods.
I suggest using the Raider Hatch Key to make a quick escape after obtaining all the loot. The Raider Hatch key is obtainable at the Shani trader.
Overall, you don’t find anything extraordinary here, but pretty good if you want to restock on some supplies and make your journey easier. I hope that this ARC Raiders guide helped you.
