Speculation??
None whatsoever. Enoch specifically mentions that he was taken to all 7 heavens over the course of 2 months,...
(hmmm, sound familiar, different levels of heaven?? Where have we heard that before?)
...and was there commanded to write all that he learned and saw. He says he wrote 366 books, to be exact, and gave them to his children when he died.
Why on earth would not everyone who believes in God want these records in their entirety?
And just for clarification, we (LDS) specifically want the records of Enoch because they are prophesied of coming forth in the due time of the Lord and giving us all additional truth.
D&C 107:57 These things were all written in the book of Enoch, and are to be testified of in due time.