Tabs not in correct position and side flaps buckled are found in the trial and it is due to mis-handling and/or lack of experience of operators at the assembling position.
Rollovers at lids are not firmly pressed at corners and do not perform “pre-folding” which makes the tabs cannot fall into the slots.
Side flaps on bases are already creased in the middle when putting the rollover into the slots, and obviously not resulted by stacking force.
Workers do not strictly follow the assembly guide, which should rotate to the another side after finishing the first side.