Here are some Watchtower quotes:
*** sg study 3 p. 17 The Bible—Our Principal Textbook ***
With the death of John, the last apostle, this reliable chain of divinely inspired men came to an end. And so with the Revelation, John’s Gospel and his letters, the Bible canon closed. The sixty-six books of our Bible, by their harmony, testify to the oneness of the Bible, and recommend it to us as indeed Jehovah’s word of inspired truth.
*** si pp. 302-305 Study Number 4—The Bible and Its Canon ***
"A glance at the accompanying chart reveals that a number of fourth-century catalogs of the Christian Scriptures, dated prior to the above-mentioned council, agree exactly with our present canon, and some others omit only Revelation. Before the end of the second century, there is universal acceptance of the four Gospels, Acts, and 12 of the apostle Paul’s letters. Only a few of the smaller writings were doubted in certain areas. Likely this was so because such writings were limited in their initial circulation for one reason or another and thus took longer to become accepted as canonical.
... It was not until critics like Marcion came along in the middle of the second century C.E. that an issue arose as to which books Christians should accept . Marcion constructed his own canon to suit his doctrines, taking only certain of the apostle Paul’s letters and an expurgated form of the Gospel of Luke. This, together with the mass of apocryphal literature by then spreading throughout the world, was what led to statements by catalogers as to which books they accepted as canonical."
The impression is given that the Canon closed with John, with vague reference to the fact that there was some minor questions over the books. It is made to seem that The Catholics came and bastardised the already accepted canon.
The Old Testament is even more attributed to the hand of God
*** sg study 3 p. 16 The Bible—Our Principal Textbook ***
The canon of the Hebrew Scriptures was well fixed by the end of the fifth century B.C.E. It contained the same writings that we have today and which are now divided into thirty-nine books. No council of men made them canonical; from their beginning they had divine approval.