In the Professor Latilong game, how did Professor Latilong find his way to each archaeological treasure?

In the mid-seventies when a team from the National Museum of the Philippines excavating a site was told that a strip of metal with some kind of writing had been found by a treasure hunter.

All of the Professor Layton titles are puzzle adventure games for Nintendo DS starring Professor Layton and Luke Triton; in these adventures the player investigates and solves one main mystery by tackling a wide variety of numerous, smaller puzzles to make progress and uncover secrets.