Subsequent investigation found the original manuscript at the archive at the site of St. Paul's Cathedral, which had been copied in the eighteenth century, but the copies had been lost in various places in Spain and Portugal; moreover, the original was destroyed in a fire at the cathedral in the nineteenth century.
その後の調査で、聖ポール天主堂跡の文書館にあった原稿から18世紀に写本がとられたが、スペイン・ポルトガルで散逸したこと、一方原稿は19世紀、聖堂の火災に伴い焼失したことがわかった。