Isn't the art object on the piano in this capture from the ep -
- the same object that's at the bottom of the staircase when we finally get to see the Old House? If so, apparently Liz decided she no longer liked it and had it banished to the Old House. Or maybe David decided to do a little decorating, swiped it (afterward feigning no idea whatsoever what had happened to it, of course
) and on one of his many trips to the Old House to play and/or talk to Josette, he brought it there to adorn the staircase. We'll never know for sure...