Let's start with the first reason. There are many wells in the Forbidden City. Ancient people took water from here. Don't think that the water in the well is stagnant water or rain. In fact, every well is connected with an underground river. After the jewels were thrown in, most of them were washed away by underground rivers and rushed into various rivers, where they could not be found.
Secondly, everyone who has been to the Forbidden City knows that the wellhead of the Forbidden City is particularly narrow, and people who are a little fatter will get stuck when they go in, and you can't explore how deep the well is, and it is not convenient to take it with mechanical power. Moreover, in the process of construction, if the well is accidentally damaged, it will be considered as destroying cultural relics. No one will contract such a job, it is better to leave a monument.
Third, don't think that people today are so smart that they can think of salvaging ancient jewels. As early as the end of the Qing Dynasty, when Puyi was unable to take charge of the overall situation, he was thrown into the Qing Palace for confinement. People in the palace had a hard time at this time, so some eunuchs and maids thought of salvaging the treasure in the well. At that time, people salvaged jewels to survive. After all, they tried their best, so most of the jewels that could be fished up were fished up. Why bother now?
Fourthly, many people will die in the wells of the Forbidden City over the years, and Yin Qi can be said to be the tallest anywhere in the Forbidden City, so most people will not start fishing for fear of losing their lives. The shaft wall is slippery all the year round and can only accommodate one person. In order to ensure the safety of personnel, this will not be done.
Compared with those cultural relics, don't rashly lift this veil, keep the original appearance of the Forbidden City, and give people room for reverie about the Forbidden City, isn't it?