With the latest Bungie Bounty, Bungie was talking with the Dads of Destiny.
Near the end of the stream around the 53 minute mark, discussion arose about secrets in Destiny and undiscovered mysteries.
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Another Chest?
Shortly after they mentioned that Harold Ryan was the one to approve all of Destiny’s Easter Eggs, one of the DoD crew asked, “Are there any more chests in the Vault?”
A few seconds later Urk says, “Yes, the answer is yes.”
Edit: Urk has stated that he misheard the question!
He went on to say that,
[…] my brain turned the question into something along the lines of, “Is there a reason to return to the Vault of Glass?”