Place on your work surface with the side with the heaviest creases facing upwards.
Work on one end at a time. Bend up side ends.
Bring together both box sides and the box ends together.
Fit a handle into both holes / handle lugs on the sides of boxes.
Lower the handle into the end of the box.
Ensure all box end pieces fit / clip under the handle.
Clip in handle. This requires lifting the handle through the hole. Repeat for the opposite end.
Assembly of internal dividers. Slot the width pieces into length pieces.
When the internal dividers are complete. Fit into the box.