A method of processing boxes includes shuttling a box in a first direction and cutting to separate outer flaps of the box from one another as the box moves past a cutting tool in the first direction, wherein the outer flaps overlie inner flaps. The method includes engaging a set of opening guides with the outer flaps of the box to drive the outer flaps open. The method includes opening inner flaps using shape memory and shuttling the box in the first direction over an inclined plane after the inner and outer flaps are open to flatten the box.