In order for us to get one of the locations of another wall piece, we think we need to fill up the 50 seats of the for the phantom's play, mentioned in This post . Send in your emails to This Link to fill the spaces up, if you haven't already. We currently just need 19 more people. Lurkers, if you're reading this I invite you to do the same!
The goal of this is not necessarily to find and seal it within the wall, but to obtain it's location as a precaution for the future.