Jerome made a distinction between those books that are found only in the Septuagint (which he called “Apocrypha”), and those books that are found in both the Septuagint and the Hebrew texts (both of which are inspired texts, FYI).
I disagree. Jerome pointed out those texts are not inspired.
Are any of the authors acknowledged as prophets?
Do any of the authors even claim to be writing under divine inspiration?
The inspired books of the Bible state they are inspired. The authors claim to be speaking for God and bear witness that the other prophets also spoke for God.
Gen 1:3 And God said,
Gen 1:6 And God said,
Exd 3:14 And God said unto Moses, I AM THAT I AM: and he said, Thus shalt thou say unto the children of Israel, I AM hath sent me unto you.
Lev 1:1 And the LORD called unto Moses, and spake unto him out of the tabernacle of the congregation, saying,
Num 6:1 And the LORD spake unto Moses, saying,
Deu 2:2 And the LORD spake unto me, saying,
Jos 4:1 And it came to pass, …, that the LORD spake unto Joshua, saying,
Jdg 1:2 And the LORD said,
Jdg 7:2 And the LORD said unto Gideon,
1Sa 3:4 That the LORD called Samuel: and he answered, Here [am] I.
Also, when the prophesies came true it was proof of their inspiration.
The Apostle Paul claimed inspiration 1Galatians 1:11-12 Now I want you to know, brothers, that the gospel preached by me is not of human origin.
For I did not receive it from a human being, nor was I taught it, but it came through a revelation of Jesus Christ.
1 Cor 14:37 If anyone thinks that he is a prophet or a spiritual person, he should recognize that what I am writing to you is a commandment of the Lord.
Peter acknowledges Paul’s writings are indeed God’s written Word.
2 Peter 3:15-16 …as also our most dear brother Paul, according to the wisdom given him, hath written to you: As also in all his epistles, speaking in them of these things; in which are certain
things hard to be understood, which the unlearned and unstable wrest, as they do also the other scriptures, to their own destruction.
Are any of these evidences found in the deuteros?
Does any credible witness claim even one of the authors to be a prophet?