"finders" audio files is used in Chapter III's camera section. If you stand still for too long it starts playing, so technically it is used in the game and should be listed as Secrets/Easter Eggs. Proof: https://youtu.be/AkT8Wxl7mf4
I've known about my error for a while from other people but haven't found real footage of this easter egg. Thanks for pointing this out! I'll make sure to credit the uploader when I get back into the swing of things. Life is a little hectic right now so I'm not so active on here. If you're willing to edit those pages, then go all out. These little edits help out in the long run!