Re: Mushaf Fatima, Al-Jamia, and Al-Jafr did exist.
Brother if you just do translation of what is highlighted in Red, it will SUFFICE...
where it is said by Imam Sadiq (AS) " it is Quran... " according to Arabic version " IT IS MUSHFA..."
Since it is not Quran so if (this book) contains three times or four times of Quran, does it matter?
The Actual Translation as per arabic version : " Abu Basir quoting al-Imam al-Sadiq(A.S.) as saying: The Mushaf of Fatima(A.S.) is with us and how do they know what her Mushaf is. I asked: What is the Mushaf of Fatima (A.S.)? He replied: It is a Mushaf in which exists three times as much as in the Qur'an. I swear to Allah, there is not a single letter of the Qur'an in it."
Conclusion is left to you
you changed your authentic books, if you do not have actual saying of hz. jaffer-e-saddiq rah allow me to provide correct text of his rah saying.
I asked: What is the Mushaf of Fatima (A.S.)? He replied: It is a Mushaf in which exists three times as much as in the Qur'an. I swear to Allah, there is not a single letter of the your Qur'an in it."
you missed word "your".