[url=http://www.bungie.net/News/Blog.aspx?mode=news#cid32192]Let's open the Sack[/url].
As for the challenge, guessing at Bungie Lore won't be enough. We want to see your problem solving mojo. Team up if you will, but a winner is just a guesser without documentation of how they solved the puzzle.
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I'm not sure if anybody has noticed this but, if you connected the dots you get a [url=http://i289.photobucket.com/albums/ll215/Verachi/Mailsackchallenge.jpg]Pentagon[/url] just like that pentagon on top with the 4. This probably wont help with anything but its something that I noticed.