FIG. 1 is a front view of a document storage box showing my new design;
FIG. 2 is a rear view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a left side view thereof;
FIG. 7 is a top plan view thereof in a state of being unfolded; and,
FIG. 8 is a perspective view thereof, in a condition of use.
The dashed broken line showing of the document storage box is for the purpose of illustrating portions of the article, and the dot-dash broken line defines the bounds of the claimed design. The dashed broken line and the dot-dash broken line form no part of the claimed design.