Yes, there were Greek papyri found mixed in with the Kokhba papers. But the Kohhba papers were found at a site called Wadi Muraba'at, which is separate from the site of the discovery of the Dead Sea Scrolls, which contained fragments of the Septuagint. Don't confuse the two. Qumran, the source of the Dead Sea Scrolls was destroyed by the Romans in 68 A.D. Even so, the date of death for Kokhba in 135 A.D., which you quote, is well before the birth of Origen in 185 A.D. So that is even further proof, that you have now provided, that Origen is not the originator of the Septuagint. You are arguing against your own claim.
The only books that had probably been translated into Greek with any seriousness were the 5 books of the Law.
I don't know what you mean by "with any seriousness". The fact is that all of the books of the Old Testament were translated into Greek and were in use by the Jews before the time of the first Christians. I am sure all the tranlations were conducted with "seriousness".
Everything regarding the Septuagint is speculation including yours.
No it isn't. I've posted fact above.
Josephus says that the Septuagint was only the 5 Books of the Law. Check him out. Even Jerome cites him on this point. The Septuagint was only the Pentateuch in Greek according to Josephus --- not the entire Old Testament.
Yes, as far as the initial effort. But all of the books were eventually translated to Greek.
Well which came first, the Hebrew or the Greek? Listening to Septuagint apologists one might get the impression that the Old Testament was originally written in Greek and not Hebrew.
It was found that some of the Septuagint fragments recovered from Qumran more closely reflect the Hebrew texts found there than the Masoretic texts do. And this is because the Septuagint was translated from earlier Hebrew documents than the Masoretic texts originated from.
He used the versions of the Ebonite’s’ Aquilla (c. 128), Symmachus (c. 180-192 A.D.), and Theodotin (c. 161-181) for the Hexapla reconstruction, along with three other anonymous translations that have become known as the Quinta, the Sexta, and Septima. Is this true or not?
Or are you laboring under the misconception that the Septuagint today can be found someplace earlier than Origen's Hexapla? If so, then where is the Septuagint found earlier than Origen's Hexapla?
And tell us where there can be found any manuscript evidence of a pre-Christian Septuagint.