The ornamental design for a foliagebox, as shown and described.
FIG. 1 is a front perspective view of a foliage box, showing my new design with an outer portion shown separated from the inner portion;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a right side view thereof;
FIG. 4 is a top view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a bottom view thereof; and,
FIG. 7 is a rear elevation view thereof.
The broken lines in the drawings depict the placement relationship between the two components of the foliage box and form no part of the claimed design. The additional broken lines shown in FIGS. 4 and 6 represent portions of the foliage box that form no part of the claimed design.