We claim the ornamental design for a storage box, as shown and described.
FIG. 1 is a first perspective view of a storage box;
FIG. 2 is a perspective view thereof, with the lid opened at a 45 degrees angle;
FIG. 3 is a perspective view thereof, with the lid opened at a 90 degrees angle;
FIG. 4 is another perspective view thereof, with the lid opened at a 75 degrees angle;
FIG. 5 is a perspective view of the storage box in a disassembled state, with the lid expanded and dividers removed; and,
FIG. 6 is a perspective view thereof, with the lid further expanded, the floor base removed, and the dividers not shown for ease of illustration.
The broken lines shown along the side edges of the lid on the surface of the storage box represent stitching, while all other broken lines represent portions of the storage box and none of which form part of the claim.