The ornamental design for a golfcartcargobox, as shown and described.
FIG. 1 is a front perspective view of the golf cart cargo box showing my new design as positioned on a golf cart shown in broken line;
FIG. 2 is a front perspective view thereof;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a right side elevation view thereof;
FIG. 5 is a rear elevation view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a left side elevation view thereof.
The broken lines in the drawings illustrate portions of the golf cart cargo box and environmental golf cart that do not form part of the claimed design.