the boxes look Canadian, the markings are NATO stock numbers, and the 105mm APFSDS-T was one of the main rounds used in our old Leopard C-1 Tank, which has been replaced by the Leopard 2 which fires a 120mm round. Having handled many a tank round and many a box like this they are a two man lift. Now this particular box may have started out from the US as the gun listed for use on the box is the M-68, not the L7A1, same chamber and bore size just the M-68 is the American gun barrel and the L7A1 is the British gun barrel. Seeing how this is for sale in a Canadian Store most likely the Canadian surplus as it's not longer in use.