As I said, the letter to Aristeas has been proven to be false. It was not a 2nd or 3rd century B.C. document that proved the origin of the Septuagint and that it pre-dated Christ. But, as I have already said, it hasn't stopped most from still believing it. And, as JohnRH has pointed out, all your examples are after the time of Christ.
Well, yes it is generally accepted that there is a Septuagint and that it was translated before the time of Christ. Even the translators of the King James Version believed the fable. And most do today. Thus you have most all modern day translations based on the Alexandrian Texts instead of the Masoretic Text. But it doesn't change the 'fact' that there is no proof of any such Septuagint and that it existed before the time of Christ.
Concerning Origen's Hexapla, the Hexapla is Origens' translation of the Old Testaemt . It was written 200 years after Christ. It also contains the Apocryphal books. Many believe that Origen copied directly from the so called 'Septuagint'. This is false because the Apocryphal books are dated somewhere between 1st century B.C. and 1st century A.D. In other words, the Apocryphal books were not yet written in 250 B.C. which is the supposed date of the Septuagint. Which means Origen's work is no proof of any Septuagint that predates Christ.
The age of a manuscript is always important, but it is not by any means the only thing considered when determining it's correctness. The Alexandrian Text is called the Minority Text for a reason. It is based on just a few manuscripts whereas the Moasoretic Text is based on the Majority of manuscripts. More is always better as you have more comparison to make. And understand that some of the older versions which the Masoretic Text uses, are taken from the 'Old Itala Bible' which is dated back to the time of the apostle's.
I don't know what you mean when you keep saying the Masoretic Text was used outside the Church. The Alexandrian Texts (Minority Text) are known to come from Alexandria. The Masoretic Text (Majority Text) is from Palestine, or Israel. During the early Church those who used this text are centered in Antioch. You have heard that name, correct? It is where Christians were first called Christians. It is Paul's church. So you need to explain what you mean when you say the Masoretic Text was used outside the Church.
The story of the Septuagint was nothing more than an attempt to lend credibility to the Alexandrian Text. These were rejected by the Jews of Palestine as they were different in many ways to their writings. And, the Apocryphal books were also rejected by the Jews of Palestine, which is why Protestants rejected them also.
In all likelihood, what people are calling the Septuagint is nothing more than Origen's translation of the Old Testament. And that itself should be a red flag of warning to people everywhere.
Quantrill