I think they mean the scrap of paper torn out of the book:

> In 1949, a pathologist had found a bit of paper concealed in one of the dead man’s pockets, and on it were printed the words Tamám Shud, the Persian for “finished.”

The scrap of paper they found in his pocket which had a scrap of paper with words equivilant to “The End” in a foreign language, ripped out of the last page of a book.