John Gee of the LDS Maxwell Institute for Religious Scholarship asks: "How did Joseph Smith manage to publish in the Book of Abraham a story that closely matched a Middle-Bronze-Age Syrian autobiography that would not be discovered for nearly a hundred years?"
I agree with Brother Gee that the style in this text is unlike anything else found in the region except the Book of Abraham. The text dates to 200 years after Abraham. So, while Brother Gee may not feel like he can say it in scholarly paper, it seems evident to me that this authentic ancient text closely emulated the original Book of Abraham.
God hath said, I will establish my word. Nevertheless, God sendeth more witnesses, and he proveth all his words. (Book of Mormon, 2 Nephi, 2 Nephi 11:3)
And if they are not the words of Christ, judge ye—for Christ will show unto you, with power and great glory, that they are his words, at the last day; (Book of Mormon, 2 Nephi, 2 Nephi 33:11)