Another Embargo Undone?

The Bookseller is reporting that A&C Black is very concerned that the embargo keeping the latest Wisden Cricket Almanac off the shelves until April 6th was broken. According to Nielsen Bookscan, 816 copies of the book have been sold before the embargoed date. That's a lot of copies but could this be a case of mistaken identity or bad data? Why didn't anyone notice until the numbers were reported? We shall see.