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

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.

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.