If this MC rifle was planted before the fact then the conspirators must not have realized that west side of the floor was being laid with new plywood necessitating having to move boxes
Seems like a risky place to pre hide the rifle near the stairs
However, if rifle was hastily planted after the fact , near the stairwell would be quickest place sliding under the pallettes
Maybe Weitzman observed or at least realized the rifle was moved from UNDER a palette to its new position In a gap between 2 parallel rows of boxes
Perhaps Weitzman even witnessed a hand sliding a rifle thru the space of the pallet In coincidence with Boone shining a light
At the very least, Weitzman may have witnessed the destacking of the wall of boxes in order to photograph a rifle no longer laying “flat” and within the frame of a wooden palette
Instead, now the rifle was in vertical position up against a wall of boxes with NO wooden palette underneath the boxes