Materials and method for making a container with a locking closure

A method of forming a locking closure of a container, the container including bottom, side, and top walls with at least one of the walls being an opening wall formed of panels which provide an opening to an interior of the container, and which panels overlap to provide a locking closure of the opening wall, the method steps comprising;

• providing a first, second, third and fourth panels of the opening wall, the first panel being a bottommost panel, the second and third panels lying adjacent to opposite sides of the bottommost panel, and the fourth panel being a topmost panel;
• lowering the bottommost panel to partially cover the interior of the container;
• lowering the second and third panels to at least partially overlap the bottommost panel;
• lowering the topmost panel to at least partially overlap the second, third and bottommost panels;
• lifting a tab portion of the bottommost panel upwardly and above the topmost panel;
• and
• positioning the lifted tab portion to lie in contact with and in an overlapping position on top of a portion of the topmost panel, thereby forming the locking closure.