The Vatican Library is 1700 years old, It is the publicly known authoritative collection of manuscripts, codices and books. It is a front so that others don't dig deeper to find the true Libraries.
Interesting reading the trance mutterings and answers to questions by Edgar Cayce.
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“The one in the Atlantean land, that sank, which will rise and is rising again; another in the place of the records that leadeth from the Sphinx to the hall of records, in the Egyptian land; and another in the Aryan or Yucatan land, where the temple there is overshadowing same.” (2012-1)
“For the entity's tomb then was a part of the Hall of Records, which has not yet been uncovered. It lies between—or along that entrance from the Sphinx to the temple—or the pyramid; in a pyramid, of course, of its own.” (2329-3)
“Hence we find the entity…was the first to set the records that are yet to be discovered…and for the preservation of the data, that as yet to be found from the chambers of the way between the sphinx and the pyramid of records.” (1486-1)
Cayce tells us that the second pharaoh, Araaraart “will be found…in the North Corner of the second Pyramid…” (341-1)
In a subsequent reading, he said the same entity, Araaraart, will be found “in the upper chamber of the northeast corner of the first pyramid builded.” (341-8).
In another reading, he said, “In the first of the pyramids built in the Valley of the Shadow, there still may be found unto this day portions of data as was preserved with the ruler, who afterward was worshiped as the representative of God made manifest in earth. These will be found in the northwest corner or chamber of this mound.” (5748-4)
https://www.edgarcayce.org/12362/