The ornamental design for a packagingbox, as shown and described.
The patent or application file contains at least one drawing executed in color. Copies of this patent or patent application publication with color drawing(s) will be provided by the Office upon request and payment of the necessary fee.
FIG. 1 is a plan view in an unfolded state of a packaging box, showing my new design; and,
FIG. 2 is a front, top and right-side perspective reference view in a folded state thereof.
The back side of the unfolded state of the packaging box is plain and unornamented.