Those photos indicate that it would be impossible for Weitzman to have seen the MC rifle from some position east of the 2rows of boxes even if his face was to the ground.
The only way Weitzman could have seen that MC rifle while looking “under a flat” is 2 possibilities:
1. Weitzman was looking North THRU the open approx 4” space of a pallet from the south side of that pallet and saw a rifle IN that pallet space
.2. Weitzman was looking North THRU the pallet from the south side and he saw. the WHOLE rifle between the north side of the pallet and south side wall of the stacked boxes
3. Weitzman was looking THRU the pallet and saw a PORTION of the rifle thru a vertical gap between 2 adjacent bottom level boxes that formed the south side wall , while Boone was looking on the north side of that wall and shining his light on it.
It’s not certain (imo) what the original configuration of the bottom level of boxes was and if they were ALL end to end with no vertical gaps as it appears that SOME of them were in the photo or if the box that was removed had been snuggly fitting which would therefore rule OUT probability of a gap that Weitzman could have looked thru.