And what are they going to do with a note like that? It's not like it mentions her name or anything, and what can they do about it? And say that it was in the middle of the Darkness where it should have been easily eaten or disintegrated by any of the monsters?

[Everyone knows in shows and video games, the police can't do much.]

They're totally not going to believe that; besides, whoever provided the clue should always remain a secret until near the end of the game!

She'll be found, you can count on it!