The tombs, each constructed of green brick and decorated with lavish engravings, were buried partially underground, until they had their tops shaved off like Dennis Hopper in Speed by a bunch of earth movers that were being used to develop the area to make sufficient room for rich people to buy terrible furniture from a brand new IKEA store. One tomb was drilled entirely through its center by an excavator, leaving half of a nearly 2,000-year-old coffin dangling from its ruined ancient walls like a dreamcatcher in a Chevy Avalanche. The priceless artifacts inside were either crushed into powder or left exposed in the dirt and rain to be stolen by relic traffickers.
Ostensibly, there are laws in place that are supposed to protect China's countless historical buildings from being robbed, damaged or flat-out razed by private individuals and billion-dollar corporations alike. However, China famously doesn't give one pent-up pretzel-twisted shit about anything that isn't "China's money," so those laws are enforced with a regularity that can be described at best as "selective" and at worst as "not at all."
"No, 'at worst' was that one official who kept insisting that he get to pee on everything first."
Besides, most companies are happy to just pay whatever fines they incur from smashing up irreplaceable history rather than halt production of whatever Walmart they're building atop the shattered stone memories of past dynasties. For instance, sections of China's Great Wall, which you may recognize as one of the most famous things ever built and the only man-made structure that can be seen from freaking space, were permissibly demolished to clear land for a factory, so you can imagine how much careful attention was given to 10 ancient corpse lockers full of people that no one has ever heard of.