The group of ninjas from Japan were under the orders of a man named Ninja King, but the rich valuables that were great in variety in the royal mausoleum dazzled them, and they could not take all of them away in one go.
Ninja King was worried that if they transported the treasure multiple times, the martial artists of China would catch wind of it and surround them, which was why they decided to stay in the royal mausoleum. In the meantime, he ordered a few scouts to sail across the seas and bring reinforcements. He wanted to sweep away the treasures of Yan Dynasty's royal mausoleum in one go and transfer all of them back to Japan.
However, they never touched the boxes, because they wanted to open them once their reinforcements arrived, and so they were perfectly preserved.
