From the New Era:
"Joseph Smith had in his possession three or four long scrolls, plus a hypocephalus (Facsimile 2). Of these original materials, only a handful of fragments were recovered at the Metropolitan Museum. The majority of the papyri remains lost, and has likely been destroyed. Critics who claim that we have all, or a majority, of the papyri possessed by Joseph Smith are simply mistaken. The Egyptian characters on the recovered documents are a portion of the "Book of Breathings," an Egyptian religious text buried with mummies that instructed the dead on how to successfully reach the afterlife. This particular Book of Breathings was written for a deceased man named Hor, so it it usually called the Hor Book of Breathings. Other than the vignette represented in Facsimile 1, the material on the papyri received by the Church, at least from a standard Egyptological point of view, does not include the actual text of the Book of Abraham."
New Era, January 1968.