No, I remember the paperback edition (even though the concept of such a large paperback is still baffling) being branded with New York Times Best Seller on the cover. Its very hard to find accurate sales of any books, with the exceptions of things like Harry Potter or Dan Brown. Many times you can find out the initial printing amount, and when you see it mentioned that they're printing more you know they've gone through that much, but that's as far as I've been able to find with most books.