Where is the original collection of the book "The Tale of the Western Regions of Datang"?

There are dozens of ancient written records of the Western Regions of the Tang Dynasty provided by Turpan Studies, which have been translated into French, English, Japanese and other foreign languages since the second half of the 9th century. Before the discovery of this kind of written book, the earlier ancient books were Dunhuang manuscripts, with 1, 2 and 3 volumes, all of which were incomplete volumes, and calligraphy was not published. The first volume and the third volume are in the British Museum, and the second volume is in the National Library of Paris. Dunhuang was written in the 8th and 9th centuries A.D., that is to say, it was the oldest story about the Western Regions in Tang Dynasty before it was discovered 100 years after it was written. The ancient manuscripts collected in Japan and the Korean manuscripts are much later than the Dunhuang manuscripts. The handwriting unearthed in Tuyugou Cave Temple has beautiful fonts, and the calligraphy is superior to the three kinds of handwriting in Dunhuang. The earliest edition of The Tale of the Western Regions of the Tang Dynasty was published by Pingjue Temple in Fuzhou in the second year of Chongning in the Northern Song Dynasty. There are only four volumes left, which are now in Peking University Library. In addition, there is a block print of the Northern Song Dynasty in Dongsi Guanzhi Institute of Japan. Now the contents of all kinds of books are the same, and the differences between words are caused by the general law of copying ancient books at that time.