Folding Storage Box

FIG. 1 is a perspective view of a folding storage box showing my new design. FIG. 2 is a front view thereof. FIG. 3 is a rear view thereof. FIG. 4 is a left side view thereof. FIG. 5 is a right side view thereof. FIG. 6 is a top view thereof. FIG. 7 is a bottom view thereof. FIG. 8 is a rear, right, bottom perspective view thereof; and, FIG. 9 is a perspective view thereof, shown the folded state. The broken lines in the drawings depict portions of the folding storage box that form no part of the claimed design.