Tony,
You may have read about this in an early edition of Gary Cooper's biography, E.J: The Story of Edward John Smith, Captain of the Titanic. That's where I first read about it. Then I placed the detail in my own book, The Watch that Ends the Night, so you may have read it there. I have corresponded with Gary recently and he explained that the early edition of his book has got it wrong. I'm not certain where Gary came up with this himself. But as far as I know at this point, Smith really WAS aboard Titanic for the sea trials and delivery trip. I might add that Gary Cooper's book is otherwise excellent and very thorough. He has an updated version of the book coming out from History Press that corrects the error. I highly recommend it.