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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Holy monkies this story is amazing, I mean I collected all these things right off the bat but never actually bothered with the story until now. Anyone who is still interested, it's all here. [url=http://www.bungie.net/images/games/halo3odst/community/sadie/index.html]Sadie's Story[/url]