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;
FIG. 7 is a left elevation view of the design illustrated in FIG. 1; and,
FIG. 8 is an enlarged view of the A—A, B—B portion of the right elevation view of the design illustrated in FIG. 1.