that box placed on the 6th/SE window ledge approx 30 secs after Bonnie Ray Williams left that window at 12:24 is an illogical thing for a shooter to have done, since it’s precariously balance at an angle rather than level and parallel on the inside of the window frame.
I don’t see how it was practically used as a rifle rest because the shooter would have had a very awkward stance.
And if the purpose was to block sunlight then a parallel to the wall arrangement would do much better than this odd angled boxes and risking unnecessarily the box balanced precariously falling out the window.
So the propose of the box in the window placed at an angle so the corner sticks out on the window ledge may be for some other purpose.
The gunman seen at the SW window by Arnold Rowland was not apparently intending to use any boxes so it’s seems a bit ridiculous for this gunman to be hastily at the last minute placing boxes at the SE window at 12:24:30 , risking drawing attention and suspicion of any SS FBI, DPD, etc in the Dealey plaza area.
It’s seems to defy probability that no experienced security authority noticed the one window at the SE high 6th floor corner of the TSBD had been lowered from its halfway open position when BRW at that window at 12:20 , to a 1/4 open position by 12:25.
Nor did they notice a man moving a box onto the ledge with a corner sticking out at about 12:24:30.
Rowland stated he looked up at 12:25 and did not see BRW anymore in the 6th floor SE window. How is it Rowland missed the addition of a box on the ledge and the window lowered to 1/4th open or a man of lighter complexion at that window placing the boxes? This activity would have had to happened just between 12:24:30 and 12:25 given the Bronson film segment am starting at 12:25 shows the box in the way node and no person moving.