We know for sure Halo 3: ODST had a poster of Destiny in it. Well, Halo 3: ODST came out before Halo Reach. So, could Bungie of added a hint to Destiny in Halo Reach and no one has found it yet?
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I'd be surprised if there wasn't some sort of Destiny easter egg in Reach. Now that we've seen some concept art and have an idea as to what we should be looking for, I'm sure we could find something.