Cooler Box

FIG. 1 is a front, left and bottom perspective view of a cooler box, showing my new design; FIG. 2 is a rear, right and top perspective view thereof; FIG. 3 is a front view thereof; FIG. 4 is a rear view thereof; FIG. 5 is a left side view thereof; FIG. 6 is a right side view thereof; FIG. 7 is a top plan view thereof; FIG. 8 is a bottom plan view thereof; FIG. 9 is an enlarged view of portion 9 shown in FIG. 1 ; and, FIG. 10 is an enlarged view of portion 10 shown in FIG. 2 . The broken lines shown in the drawings illustrate portions of the cooler box that form no part of the claimed design.