Susha, I have a little help from my camera. I can see much better with it, better than I can with binoculars. Beau has such a dark head that he is easy to identify. If I see an adult (white breast), a bit large (female) with a mylar bar on the cheek, I do sort of assume it is Beatrix.
Today at 6:00ish, there were two adults on the south sign of the Diner. One was Beau, the other looked like Beatrix.