The bole for egg laying has been formed several times and then with walking around they trample things down. For the most part though when you check in you can see where Blair will lay her eggs. There have been several mating events lately, and it is believed that when it is successful it can be between 5-10 before the first egg. We just don't know when that success is. Also it is normal for there to be 3 days between each egg laid.
Videos are courtesy of Keith Byer.