Go to 7:33... He wouldn't have said it if it weren't so (maybe). "Is there an extra chest in the Vault of Glass? We'll never tell." https://www.youtube.com/watch?v=rqiIm7bXH5g EDIT: If you know Bungie, then this is HIGHLY possible. In Halo there was a puzzle you had to solve by jumping through rings in a certain order. It wasn't solved until many, many, many years later. Bungie kept quiet about it all the while, and just like this mystery chest that may exist in VoG, there may be a certain method to finding it.