Packaging Container Blank

FIG. 1 is a front view of a packaging container blank, showing a first embodiment of the new design; FIG. 2 is a front view of a packaging container blank, showing a second embodiment of the new design; FIG. 3 is a front view of a packaging container blank, showing a third embodiment of the new design; FIG. 4 is a front view of a packaging container blank, showing a fourth embodiment of the new design; and, FIG. 5 is a front view of a packaging container blank, showing a fifth embodiment of the new design. In these drawings, the solid lines illustrate the claimed ornamental design.