First I don't know where you get your information but we have the original Codex Vaticanus. You can look at it online. Scholars have examined it.
Second, one does not translate from Greek to Greek. Vaticanus is in Greek. All they would have had to do was copy the text.
Third, you claimed "MACCABEES IS FOUND IN ALL VERSIONS OF THE SEPTUAGINT." This is simply not true and the manuscript (i.e. codex) evidence proves your claim is not correct. The facts are the facts. In Codex Vaticanus Maccabees is missing. Codex Sinaiticus contains 1st Maccabee and 4th Maccabee but is missing 2nd and 3rd Maccabees. Codex Alexandrinus contains 1st, 2nd, 3rd and 4th Maccabees.
There are numerous sources which list the books found in Vaticanus, Sinaiticus, and Alexandrinus. If you like I could provide them to you.