CLAIM I claim the ornamental design for automobile rooftop cargo box, as shown and described.
FIG. 1 is a frontal perspective view of an automobile rooftop cargo box;
FIG. 2 is a rearward perspective view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a right side elevational view thereof;
FIG. 7 is a front elevational view thereof; and,
FIG. 8 is a rear elevational view thereof.
The left and right sides of the design are mirror images of each other. The broken lines are directed to unclaimed portions of the design and are for illustrative purposes only; the broken lines form no part of the claimed design.