To start off, I was using keen scout as a hunter, and when I walked out of the Archon's Forge, my radar said there was a chest nearby, so I checked it out. I was not able to open it. I tried over and over again to jump to it, but no matter how close I got, I couldn't open it. Besides that, there were also 2 other normal chests in the area, which is normal, but to see a third, un-openable chest really confused me. If you want to look for it, I was in patrol, and when you are walking into the large circular building to enter the Archon's Forge from the outside, the chest is on the snowy ledge right above/next to the far right entrance. This is the first time I have seen it, so you may not find it as well. If you have any advice, please respond to this thread.