The ornamental design for a winebox, as shown and described.
FIG. 1 is a top, front perspective view of a wine box of my design;
FIG. 2 is a top, side view of my design showing a stacked wine box array comprised of four wine box units of my design. The dashed subunits are to illustrate that wine box arrays may be comprised of any number of subunits placed in columns and/or rows;
FIG. 3 is a front view of my design;
FIG. 4 is a rear view of my design;
FIG. 5 is a left side view of my design;
FIG. 6 is a right side view of my design;
FIG. 7 is a top view of my design; and,
FIG. 8 is a bottom view of my design.
The broken lines depict environmental structures of the wine box and form no part of the claim.