The ornamental design for a packagingbox, as shown and described.
FIG. 1 is a perspective view of a packaging box;
FIG. 2 is a front perspective view of the lower box component of the packaging box from FIG. 1, shown separately for ease of illustration;
FIG. 3 is a rear perspective view of FIG. 2;
FIG. 4 is a front view of FIG. 2;
FIG. 5 is a rear view of FIG. 2;
FIG. 6 is a top plan view of FIG. 2;
FIG. 7 is a bottom plan view of FIG. 2;
FIG. 8 is a right side view of FIGS. 2; and,
FIG. 9 is a left side view of FIG. 2.
The dash-dot lines represent unclaimed boundaries of the design. These boundaries may not exist in reality in the article embodying the design. It is understood that the claims design and the ruler marks surface ornamentation extends to these boundaries but does not include the boundaries. Other lines depicted as dash lines represent environmental structure forming no part of the claimed designs.