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 want to get the Achievement. Still haven't found 15 because it is a hassle to pull up a Walk through and play at the same time.