Boiler Room: An Arrow rifle can be found in the bottom middle on the boiler. 
  Broken Home: A Revenant gun is located on the middle bridge. 
  Cathedral: A Revenant gun and grenades are at the bottom middle of the map. 
  Cave In: Check around the platforms in the middle of the map to find an Arrow 
  rifle. 
  PSI Topside: There are sniper rifles hidden around the map. 
  Shaft: Battle to the bottom of the map to obtain an Arrow rifle. 
  Shaman: Look around the center totem; there is something hidden in the tall 
  grass. 
  Town Hall: The bridge below the roof gap has a Revenant gun.