"data" seems to be the eternal mystery among writers. No other business would run that way and no other product provider would except such shoddy information.
In this technological age, every time a book is sold, that info should be available to the author. All the wondering is ridiculous.
Those who publish with Lightning Source should get a record of how many books are printed - since only enough are printed for store placement and sales. Even a record of printing should be provided to authors.