The picture is shown looking south and you can see the "rifle rest boxes" in the window. Therefore these do not represent the area that BRW indicated. He was vague but said it was around the 3rd to 4th series of windows. This was the place that Day enquired the employees about on the following Monday and represented the spot where Studebaker had informed Day they had been found. They had been moved to this spot from where Mooney indicated, the SN, likely by Gerald Hill, prior to the arrival of Fritz and co.
How were they covering for BRW? Why would they feel the need to do so?
Maybe I didn't make myself clear. One of the boxes (the one closest to the viewer) marked by Mooney on CE-513 formed part of the west wall of the SN. below is the view of the SN as seen looking from N to S. It is to the right (or West) of the area shown in CE-508 that BRW had lunch. BRW could have just walked over to the boxes forming the SN, looked inside, and seeing no one placed the chicken bone and the lunch bag on top of the box.
I don't believe Norman and Jarman were covering for BRW. They got together before their WC testimony and ironed out their different versions, i. e., who went down which elevator, but not to discuss whether either guy had to address the alleged cover up of BRW because they weren't covering up for BRW. Notice how both Junior and Harold stuck to their timeline of when they decided to go to the fifth floor. That doesn't jive with BRW timeline. If they had wanted to cover for BRW the timeline would have been the same.