Tomb robbery is originally a shameful thing, so most of them are recorded in the history of the wild and the secret. However, after the examination of historians, Cao Cao did set up a team of "lieutenants who touched gold" to dig the ancestral graves of large families for Cao Cao, take the gold and silver money that accompanied the burial, and so on.
However, Cao Cao made a rule: there was one thing in the tomb that could not be taken, and it would harm the family if he took it. Later, the tomb robbery community also passed on this "iron law" for thousands of years, and some cultural relics were preserved because of this "different rule". This rule is that the gold and silver in the tomb can be taken at will, but the jade of the owner of the tomb cannot be taken.
For example, the tomb of Liu Peng, the cousin of the Han Jing Emperor in the 1990s, was excavated before archaeologists excavated it, but the jade wall, jade dragon, jade huang, jade chong ya, and jade cover cup were all well placed and were not taken away. The famous golden jade robe was only stolen from the gold wire, but the jade robe remained. You know, jade is not only easy to carry, but also worth much more than gold. The golden jade clothes of the Han Dynasty were all made of mutton fat white jade, and each piece was worth a fortune.
Don't think that the tomb robbers don't know the goods, in fact, they are very aware of the value of these things, but they just abide by this rule of the tomb robbery world. Jade has a master before death, and under normal circumstances, the jade in the tomb is unique, so even if you steal it, you can't shoot it, and the jade of the emperor or prince has a special mark, if it is found dead, it is a small matter, and the annihilation of the Nine Tribes is serious.
Many tomb robbers are to support their families, and if they want to exchange the lives of a family for just because of a piece of jade, presumably no one is willing to do this. The tomb robbers asked for money, and it was impossible to let go of other valuable things, but they did not take these jade stones, which also officially confirmed the "rules" of the old ancestors. However, after the modern era, with the collapse of the imperial system, tomb robbers no longer have other concerns, including jade, what is valuable and what is stolen.