What is claimed is the ornamental design for a cardboard pallet topper, as shown and described.
FIG. 1 is a left front perspective view of the assembled cardboard pallet topper.
FIG. 2 is a top view of the cardboard pallet topper of FIG. 1.
FIG. 3 is a front elevation view of the cardboard pallet topper of FIG. 1.
FIG. 4 is a bottom view of the cardboard pallet topper of FIG. 1.
FIG. 5 is a left side elevation view of the cardboard pallet topper of FIG. 1, the right side being a mirror image thereof.
FIG. 6 is a rear elevation view of the cardboard pallet topper of FIG. 1; and,
FIG. 7 is a plan view showing my design in an alternate, unassembled configuration. In FIG. 7 the broken lines depict perforations or scoring which form a part of the claimed design.