FIG. 1 is a perspective view of a cover panel of a box blank showing my new design, the broken line showing of the adjacent appended components to cover panel is for illustrative purposes only and forms no part of the claimed design;

FIG. 2 is a top view of the cover panel, the bottom view being identical;

FIG. 3 is a front elevation view of the cover panel;

FIG. 4 is a left side view elevation view of the cover panel;

FIG. 5 is a right side view elevation view of the cover panel; and,

FIG. 6 is a rear elevation view of the cover panel.