That is simply not true.
First, Eusebius cites the letter from Constantine.
"Victor Constantinus, Maximus Augustus, to Eusebius.
It happens, through the favoring providence of God our Saviour, that great numbers have united themselves to the most holy church in the city which is called by my name. It seems, therefore, highly requisite, since that city is rapidly advancing in prosperity in all other respects, that the number of churches should also be increased. Do you, therefore, receive with all readiness my determination on this behalf. I have thought it expedient to instruct your Prudence
to order fifty copies of the sacred Scriptures, the provision and use of which you know to be most needful for the instruction of the Church,
to be written on prepared parchment in a legible manner, and in a convenient, portable form, by professional transcribers thoroughly practiced in their art. The catholicus of the diocese has also received instructions by letter from our Clemency to be careful to furnish all things necessary for the preparation of such copies; and it will be for you to take special care that they be completed with as little delay as possible. You have authority also, in virtue of this letter, to use two of the public carriages for their conveyance, by which arrangement the copies when fairly written will most easily be forwarded for my personal inspection; and one of the deacons of your church may be intrusted with this service, who, on his arrival here, shall experience my liberality. God preserve you, beloved brother!"
www.ccel.org
Eusebius was instructed "to order fifty copies of the sacred Scriptures." They were to be "written on prepared parchment in a legible manner, and in a convenient, portable form, by professional transcribers thoroughly practiced in their art." That's it. Constantine does not even mention Origen. There is no record for your claim, zero. It is a complete fabrication.
Second, there is NO EVIDENCE Origen edited a Bible. Origen created the Hexapla (i.e. sixfold - six columns). It compared the Hebrew text of the Old Testament to known Greek translations of the Old Testament.
The six columns were:
(1) the Hebrew text in Hebrew letters
(2) the Hebrew text in Greek letters, i.e. transliteration
(3) the Greek version of Aquila
(4) the Greek version of Symmachus
(5) the Greek version of the LXX
(6) the Greek version of Theodotion
Third, the Hexapla did not contain the New Testament nor is there is evidence Origen produce one. NONE! Again, the claim is a complete fabrication.
Fourth, your claims lack primary source. In other word, you have no evidence for your claim.
There is NOTHING in any New Testament manuscript that support the immaculate conception. If you have one which does, then name the manuscript. And given the fact you won't be able to provide one, your claim is proven false.
Here is a photo of page 195 in Fuller books.
View attachment 9583
Notice Fuller offers ZERO evidence for his claim. He cites no primary sources, and we do have primary sources from that time. In fact he cites no sources of any kind what-so-ever. This is at best incompetent research, at worst dishonest.