Do the Lawless Frontier activities and from the chests one might give you an exotic keycard on another planet playable on that day. Go there and find a forcefielded off area that requires the keycard to open it, kill the guard, loot the chest. Use a scouter shank to find the room (same spot always), it'll be where 2 chests are side by side. If someone else does that with one and you have a card for a different location you can still use that on the chest and it'll work too. Only the forcefield requires it.