I claim the ornamental design for a packing box for confectionery, as shown and described.
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FIG. 1 is a bottom view of a packing box for confectionery showing my new design;
FIG. 2 is front elevational view thereof;
FIG. 3 is a left-side elevational view thereof;
FIG. 4 is a perspective view thereof;
FIG. 5 is a rear elevational view thereof;
FIG. 6 is a right-side elevational view thereof; and,