Finding the Lost Word: Josiah’s Example of Faith & Obedience

During the reign of Josiah, king of Judah, Shaphan the scribe was sent to the house of the LORD, where he was to inquire about the money available for repairs to the temple. It appears that the temple was not the only thing in Judah that was run down – their faith and obedience to the will of God was also depleted. At the temple, Hilkiah the high priest handed a book to Shaphan, saying,
I have found the Book of the Law in the house of the LORD. (2 Kings 22:8)
It cannot be determined with certainty what “book of the Law of the LORD” Hilkiah found. Was it the original document or was it a copy?