Not sure if this has been mentioned yet, but on the Canopy above Variks, the Loyal there is a dead ghost. Jump from the box near the low end if the canopy to access it. Second one is by brother Vance. It's in the hanging bag to the right when facing him. You get to these by jumping up on boxes along the wall to reach the pipes, then walking along the pipes to the ghost. Third one. When facing Vance, turn left and take the low path. Off to the right on the oddly placed beam there is a third one. Dropping down from the higher path seems to be the easiest way to get to it. Crouch under the straps. Enjoy! Edited for more detail in locations.