The only thing we expect is the legend buried in the mausoleum of Emperor Taizong.
But whether it is true or not can only wait for archaeological excavation.
What we know now about Wang Xizhi's works are all copied.
Early moon post
For "Long live Tian Tong Post in Tang Dynasty" (II)
Kongshi China Railway
It is an imitation of the inner government of the Tang Dynasty.
Hanging and posting
Double-hook ink-filled copy in early Tang Dynasty
Shangyu tie
A copy of the Tang dynasty
Aunt post
It is one of the "Long Live the Tang Dynasty"
You have to express two thanks for your confusion.
The double hook of ink-filled book is the inner house of Tang Dynasty.
The original works introduced to Japan by the diplomatic envoys in the Tang Dynasty in Nara period are no longer in existence.