Before the council of Nicaea it was already known what's scripture and what's not scripture.
Your question is difficult to answer since I can't go ask them about it. But the gospels and epistles were there and recognized as inspired writings. And used as such (copied and disseminated).
https://en.m.wikipedia.org/wiki/Nag_Hammadi_library
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? Not sure what you want to say with the link.
Could you perhaps elaborate?
I can. However, if you don't see the obvious, then there is no point.