Yeah, the dungeon ones could be annoying if you missed them the first time. It's nice that they give you a bit of a passive bonus for finding them though. If it was just for the recordings on them, they'd be totally lame. I mean, unless you liked the stories they told. How far are you into the game?
Edit: Oh, nevermind, I didn't realize you had this game for ages. I thought you just recently got it.