Yanyan had considered this question as well. "I think it must have been hidden by the Japanese. If a Chinese person had hidden them, they would have buried them deep underground, no matter what. Even though that place is notoriously ominous, they were able to get the raw stones in, so others could get in too. Rather than just tossing them aside, it would be safer to bury them in their own foundations."
"Burying them in their own foundations is not only safer than just throwing them away, but it’s also easier to dig them back up. If you just dump them somewhere, you’d have to find a master to help you retrieve them later."
"Then why did he just throw them there?"
Chapter 197