The ornamental design for a jack mounted storagebox, as shown and described.
FIG. 1 is a top plan view of the jack mounted storage box;
FIG. 2 is a left side elevation view of the jack mounted storage box;
FIG. 3 is a right side elevation view of the jack mounted storage box;
FIG. 4 is a bottom plan view of the jack mounted storage box;
FIG. 5 is a front side elevation view of the jack mounted storage box;
FIG. 6 is a back side elevation view of the jack mounted storage box; and,
FIG. 7 is a top side perspective view of the jack mounted storage box.
The registered trademark HI-LIFT and Design® (U.S. Trademark Registration Serial No. 804,605) owned by The Bloomfield Manufacturing Company, Inc. is shown in broken lines. All of the broken lines illustrate portions of the jack mounted storage box that form no part of the claimed design.