Alopen did not have the Book of Revelation.

 No, Alopen did not have the Book of Revelation.

The reasons are rooted in the specific biblical canon used by Alopen's church during the 7th century, as well as the surviving archaeological evidence:

1. The Syriac Peshitta Canon Excluded Revelation

Alopen was a bishop of the Church of the East (historically called the Nestorian Church), and his native liturgical language was Syriac. The standard Bible utilized by this church was the Peshitta (the Syriac Vulgate).

In the 7th century, the traditional Peshitta New Testament recognized only 22 books instead of the modern 27. It completely excluded five books:

• 2 Peter
• 2 John
• 3 John
• Jude
• The Book of Revelation

Because the Church of the East did not consider Revelation to be part of Holy Scripture at that time, the manuscript scrolls Alopen carried along the Silk Road would not have contained it. 

2. Evidence from the "Jesus Sutras"

The surviving textual records of Alopen’s mission—collectively known as the Jingjiao Documents or "Jesus Sutras"—confirm what he translated for Emperor Taizong. 

Alopen's work, such as the Sutra of Jesus the Messiah, focuses heavily on the Gospels (the birth, life, and crucifixion of Jesus), portions of Isaiah, the Ten Commandments, and liturgical prayers. There is no trace, citation, or thematic imagery matching the apocalyptic visions of the Book of Revelation in any of the 7th-century Chinese Christian fragments. 

Summary

When Alopen presented his scriptures at the Tang Imperial Library in 635 CE, he brought a uniquely Eastern, Syriac-Persian selection of texts. The Book of Revelation was entirely absent from his library. 

Early Chinese Bible translation: a tale of the unexpected