I think the 7 epistles by Ignatius are considered to be authentic while the other 8 epistles may be considered to be forgery.
Wiki says the same:
Ignatius of Antioch - Wikipedia
What is important with Ignatius is that he was the earliest church fathers after the Apostles of the Bible era, ca. 40 years earlier than Polycarp.
Both refer to the New Testaments Books in their letters.
Ignatius referred to or alluded the quotations of the NT epistles for 21 books
Polycarp referred to or alluded 20 books of NT books.
So, both testified the existence of the NT Bible for 23 among 27 Books.
https://etimasthe.com/2018/11/22/ignatius-of-antiochs-new-testament/
How Polycarp gives us evidence for the early use of the New Testament | Is Jesus Alive?
Omission of 2 Peter, 2 John, are understandable, and the Revelation was written late. In other words, by the time of Apostle John's death and the following years of Ignatius and Polycarp, the New Testament Canon was already established, which is quite different from the claims by RCC as they exalt Athanasius and believe Athanasius set the canon around 367AD, though Athanasius may have contributed quite a lot in fighting Arianism.
The Development of the Canon of the New Testament - Athanasius
I don't think NT church spent almost 300 years without knowing what are the true NT Bible, but 12 apostles set the Canon of the NT virtually by the time of the death of Apostle John.
The Disciples and the Early Church people were not lazy as we imagine about them today.
In that sense, the letters of Ignatius are important and meaningful about the NT Canon.
Eliyahu