There were dozens of supposedly "inspired" books in circulation declared non-canonical by Pope Boniface. That was the whole point of declaring a canon. In a sense, it was already "in place" (it was "in place" from before the beginning of time), but human beings did the discerning by aid of the Holy Spirit, among many more texts than appear in the Bible as we know it.
That is why we have two different canons for the Bible.
SOLA SCRIPTURA
Jn 21:25 ... not everything is in the Bible.
2 Thess 2:15; 2 Tim 2:2; 1 Cor 11:2; 1 Thess 2:13 ... Paul speaks of oral tradition. Acts 2:42 ... early Christians followed apostolic tradition.
2 Pet 3:16 ... Bible hard to understand, get distorted.
2 Jn 1:12; 3 Jn 1:13-14 ... more oral tradition.
2 Pet 1:20-21 ... against personal interpretation.
Acts 8:30-31 ... guidance needed to interpret scriptures.
Heb 5:12 ... need to be taught.