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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It is a possibility that there is a Destiny easter egg hiding in plain sight now we know some of the concept art for Destiny.