Step 1: Fold along all the pre-scored edges to make the corrugated plastic more pliable.
Step 2: Fold the two small rectangular tabs upright so they are perpendicular to the bottom of the box.
Step 3: Fold the end piece with two panels over the two small tabs, tucking them into the notches.
Step 4: Repeat step 3 on the other end of the box.
Step 5: Your lid is now complete and can be put on your large catering box.
