The ornamental design for a packagingbox, as shown and described.
FIG. 1 is a top perspective view of the packaging box showing our new design, the broken lines in all figures representing environment and forming no part of the claimed design;
FIG. 2 is a front elevation view of the design illustrated in FIG. 1;
FIG. 3 is a rear elevation view of the design illustrated in FIG. 1;
FIG. 4 is a top plan view of the design illustrated in FIG. 1;
FIG. 5 is a bottom plan view of the design illustrated in FIG. 1;
FIG. 6 is a right elevation view of the design illustrated in FIG. 1; and,
FIG. 7 is a left elevation view of the design illustrated in FIG. 1.
The broken lines adjacent to the solid lines represent the boundaries of the claim. All other broken lines in the drawing form no part of the claimed design.