private function didRepackActuallyHelp(PackedBox $oldBoxA, PackedBox $oldBoxB, PackedBox $newBoxA, PackedBox $newBoxB): bool
    {
        $oldList = new PackedBoxList();
        $oldList->insertFromArray([$oldBoxA, $oldBoxB]);

        $newList = new PackedBoxList();
        $newList->insertFromArray([$newBoxA, $newBoxB]);

        return $newList->getWeightVariance() < $oldList->getWeightVariance();
    }