Well, from what I can gather, the release dates of the binder sets were these:
*Series 1-4: May 8, 2013
*Series 5-8: July 25, 2013
*Series 8-12: October 25, 2013
*Series 13-16: January 2, 2014
*"Series 17": March 22, 2014 (free with the purchase of all 16 binders).
Are these dates correct?