The ornamental design for a blank for forming a box with reinforced corners, substantially as shown and described.
FIG. 1 is a plan view of a blank for forming a box with reinforced corners
embodying my new design the opposite side being a mirror image of the side
shown; and
FIG. 2 is a plan view of a blank embodying a modification of my new design
the opposite side being a mirror image of the side shown. The blanks are
of conventional thickness with the dash lines representing fold lines.