[Josh tells me that he never referred to "just" Michael Wahrman, but in fact informed Ellen Poon, a member of that party, after the fact and outside the lobby, who was behind the gag. He also reports that the people most impressed with the gag were behind the counter, which does not surprise me at all, and in fact is part of the reason I hoped that they would read the message out loud. In other words, they would read it out loud and make a slightly bigger scene of it all because the workers at the hotel thought it was exciting, not because Josh's colleagues did. Anyway, Josh does report that he got a better room and it was very nice. That of course was an unexpected result].
In fact, the person most amused by this stunt was and still is myself. I was really delighted and still am. Probably would not work a second time (at least not at the same hotel).