Who could it be?!?
Actually, I'm rather curious to know, myself. The script I sent Jamie specified that the culprit's identity should be obscured when the mask came off, so that it could be anybody. Unfortunately, "the thief's face remains unseen" clearly failed to convey my full meaning. Now I have to decide whether to go ahead with my original ending or scour our archives for a brunette with short, curly hair and a reason to hate Jamie. I, for one, lack only the curls.