Thank you again! I suppose the museum staff may know: it'll be worth visiting anyway, but finding the room (and the ante-room....) would be an added bonus. There was a brief article in one of the British broadsheet newspapers a couple of weeks ago about touring the sites of the Revolution, but it just said the entire Tuileries was destroyed!
(It's funny- I've lived in London for years, and rarely went to the museums etc - now I'm stuck in Liverpool for a bit I'm suddenly desperate to see things!)