The Vatican's Arabic manuscripts catalogue is available online.
I don't recall any attributions to Jafar al-Sadiq, and even if there was, then it's most likely a misattribution, since 2nd century texts are too rare.
The Vatican's collection isn't that special in my opinion.
@umar___________
@Farid_0v
There’s always some hidden conspiracy theory to every one of their beliefs
And they translate the Quran with a Baatini way, always look for some “mysterious/hidden meaning”