I'm an Italian gentile believer in HaShem, who commits himself to observe the Noahide Laws, as commanded by the Creator in the Torah.
If I'm not mistaken, according to Jewish sources, the Pentateuch was written by Moses on the dictation of HaShem. Does Jewish tradition report a narrative on what happened to the original manuscript? I think I understood that this text was kept in the first Temple: was it destroyed during the fall of Jerusalem by the Babylonians?
As explained in The Ark King Yoshiahu (Josiah) is supposed to have hidden the Ark and the other items that were with it in secret rooms under the first temple. These were never found during the second temple period and beyond. If the original Torah scroll was placed with the Aron (Ark), then it would be found in the secret chamber when the mashiach comes and the third temple is built.
Tradition records that even as King Solomon built the First Temple, he already knew, through Divine inspiration, that eventually it would be destroyed. Thus Solomon, the wisest of all men, oversaw the construction of a vast system of labyrinths, mazes, chambers and corridors underneath the Temple Mount complex. He commanded that a special place be built in the bowels of the earth, where the sacred vessels of the Temple could be hidden in case of approaching danger. Midrashic tradition teaches that King Josiah of Israel, who lived about forty years before the destruction of the First Temple, commanded the Levites to hide the Ark, together with the original menorah and several other items1, in this secret hiding place which Solomon had prepared.
1 such as the staff of Aaron that brought forth almond blossoms during the controversy involving Korach (Numbers 16); the jar of manna that had been placed in the Holy of Holies as a testimony; and the jar of anointing oil.
