Transport box and Christmas tree decorations.

To assemble the box, identify the large plate with multiple holes; this is the base. Assemble the inner walls first; these are the two pieces with a medium-sized tab in the center.
 

Next, identify the box walls; these have holes only on one side, and two of them have small teeth for attaching the smaller pieces to form the box.
Finally, use the plate without holes, only teeth, modify the text as desired, and attach the small piece with teeth.

That's it! You'll have your beautiful box.