The media-carrying book for the Collector's Edition of The Cutting Edge reproduces both sides of the release card for Record 1 of Blonde On Blonde. The front of the card gives the Shipping Date as 5-16-66, and the rear of the card date of the card is dated 4-27-66.  In other words, on April 27th, when the card was prepared, the projected shipping date was May 16th.  See the illustrations on this page.