The ornamental design for a box, as shown and described.
FIG. 1 is an upper perspective view of a box showing my new design.
FIG. 2 is a front view thereof, a rear view being identical;
FIG. 3 is a side view thereof, an opposite side view being identical;
FIG. 4 is a top view thereof;
FIG. 5 is a bottom view thereof; and,
FIG. 6 is a lower perspective view thereof.
The box has a woodgrain pattern thereon forming part of the claimed design. The features presented in broken lines within the box and on the bottom thereof represent unclaimed portions of the box and form no part of the claimed design.