Actively searching for information!

My friends since the fifth chest was found I am wondering if there are still chests within the vault we have yet to discover. This must be a fact as after finding all known chests and defeating the bosses the vault still reads that there are claimable rewards within. This leads me to speculate that certain conditions must be met in order to acquire these fabled chests. Keep in mind that no one would have known the 5th chest existed if they did not stop the Templar from teleporting or going down the rabbit hole where the '4th' chest is. Please, Raiders. Explore the possibilities.