Wow, do they really explain a lot of the story. The new perspective it gave on the story was very interesting. Especially when you collect the 30th audio log, and the corrupt police officer hired by Kinsler tries to kill you.
I really suggest listening to all the audio logs if you haven't already. They are very interesting.
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I can't find them all. It's no use using a walkthrough because I have no idea which ones I have and which ones I don't