Olay Walt, then if it were placed under the pallet the reason must be that in that location would be least probable place that rifle would be accidentally discovered before the shooting takes place
As opposed to having placed rifle between two vertical walls of boxes resting directly on the floor which might get moved individually as the workers were laying new sections of plywood floor prior to JFK motorcade arriving
Still don’t quite follow The reason for conspirators to place a rifle that would appear to be unfired due to corrosion Inside the barrel and a misaligned scope
If you are trying to set up a patsy to be suspected of having fired a rifle on that floor, placing a rifle with corroded barrel and misaligned scope seems a bit of a mistake imo