From the beginning of Wang Xizhi, his calligraphy works have become "treasures", especially after the era of Emperor Taizong, Wang Xizhi was highly respected and honored as a "calligrapher". Except Wang Xizhi, no other calligrapher can have this lofty status.
During the period of Emperor Taizong, the first running script in the world and the preface to Lanting were not sold, even the emperor could not buy it, so he was forced to be so kind and cheated the original work.
Today, copies of Wang Xizhi's original works are priceless, not to mention the original works. And the original is extremely difficult to find in contemporary times.