The cardboard in the boxes were to take up the extra space between the length of a 30-06 cartridge (the can is demensioned on that cartridge) and the shorter .308 round.
It is not listed in the installation instruction of the mount, but we used to install a canvas strap wrapped around the can that went behind the steel block that held the lip of the ammo can.
One has to remember that the GPMG mount was the product of those dark liberal days, when the Forces were treated like an expensive liability. It would have been suicide to have gone into any kind of combat (or even a domestic) situation with a soft skinned Jeep (although they usually did have at leat 8 coats of that heavy paint on them) and the C-1 version of the GPMG which had several technical errors in it's design.
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