@Dan: are you aware that your slightly diagonal green arrow LOS is going THRU a box which is laying on the ground?
So that would an obstruction even along a diagonal line at the ground plane from the Southeast corner side of the pallet to the Northeest corner
If Weitzman was looking instead thru the gap the arrows illustrate , then he had to be at the south WEST corner of the pallet,, looking directly NORTH and also have his head about at least 3ft above the floor plane (it appears to me ) to get a vertical diagonal LOS over a 2nd level high box on the opposite side of that gap to be able to see OVER that box to see that small portion barrel end of the rifle
There was definitely No LOS possible for Weitzman imo, to any portion of the butt and center portion of the stock of the rifle due to a box in the way at the time Weitzman and Boone discovered the rifle, That box was the one removed later to allow more of the rifle to be photographed.
So, I cannot see how Weitzman could have seen ANY portion of the rifle unless he was basically NOT looking Under the flat , was NOT at the East side of the pallet looking west or even Northwest, and he was actually STANDING at the South WEST corner of the pallet peering OVER that 2nd level box directly opposite the gap he theoretically could have looked thru.
So either Weitzman is incorrect about his position AT THE INSTANT the he saw the rifle or he meant he was EARLIER looking “under a flat “ before then changing his position to the gap and THEN saw the rifle as he stood up and able to look OVER a 2nd level high box to see a portion of the rifle barrel.
So the choice still seems to be either Weitzman was mistaken or he saw the rifle in a different location. If the latter , then Boone had to have seen the rifle in that other location also and then both men opted to participate in a post event fraud.
@Walt: if the rifle was preplanted then it should not ALL the rifle be inside the pallet as surely the intent was to make sure the rifle was WELK hidden so not to be inadvertently discovered. Therefore I have to disagree with the idea that any portion of.the rifle would be visibly sticking out of the pallet.
WHEN were these photos taken?
Please explain why Tom Alyea's film shows the rifle lying on it's side when Lt Day reaches out to pick up the rifle by the leather strap.

He seems to have misunderstood that Weitzman was on the floor looking through a pallet.
In the graphic the yellow/orange arrows are Jerry's and are part of the original graphic to which I have made some additions.
Ignore the yellow/orange arrows.
The stack of boxes marked with a green "A" in each pic rests on a pallet [it is the same stack seen from different angles]
To the bottom picture I have added a green arrow to give an indication of Weitzman's LoS as he was on the floor looking through the pallet.
It demonstrates that Weitzman could have seen the barrel portion of the rifle from his viewpoint