Does the identification of authentic calligraphy necessarily require orderly inheritance? If it is obtained from tomb robberies or recovered overseas, is it possible to identify it as authentic?

The current level of identification is unmistakable, but it does not rule out the possibility of collusion in making fake one-stop services. If it is the proceeds from tomb robbing, you should not touch it. If it is authentic, buying or selling it is illegal, and the state will confiscate it. If it is not a story made up by the buyer, it must be fake. If someone is found living overseas, it also depends on where he comes from. It is more reliable to go to auction.