Abstract: A rotatable anvil is capable of being rotated from a rest position to engage the interior of each empty box moved on a conveyor in sequence adjacent a blank area on a selected side panel of the empty box adjacent a leading side panel perpendicular to the selected side panel to place the anvil and the empty boxes in a printing position. A printer is disposed at the printing position and adjacent the exterior of the empty boxes moved into the printing position. A control arrangement is provided to control the rotation of the anvil from the rest position to the printing position and back to the rest position and to actuate the printer when the anvil is in the printing position to print the unit price, date, total price and the like in the blank area of the empty boxes moved into the printing position.