The ornamental design for a tray for packagingbox, as shown and described.
FIG. 1 is a front perspective view of a tray for packaging box showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left-side view thereof;
FIG. 5 is a right-side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof;
FIG. 8 is a rear perspective view thereof;
FIG. 9 is another front perspective view thereof, in which additional sides are provided in broken lines and wherein two sides are provided in a partially folded position to illustrate an example environment;
FIG. 10 is another front perspective view of FIG. 9, in which the two sides are in a folded position and a third side is in a partially folded position to illustrate an example environment;
FIG. 11 is another front perspective view of FIG. 9 in which all four sides are provided in a folded position to illustrate an example environment; and,
FIG. 12 is an exploded front perspective view FIG. 9.
The broken lines are for environmental purposes only and form no part of the claimed design.
The dot-dash lines in the figures represent an unclaimed boundary line and form no part of the claimed design.