From their FAQ:
Lisa Sugar and Ken Downing, Neiman Marcus’ Fashion Director, will curate an exciting Limited Edition box full of fabulous, on-trend fashion and beauty items, and more Neiman Marcus favorites that we will deliver to your door. This Limited Edition box targets women ages 18-40 and features full-size products and premium items, including tried-and-true classics, celebrity favorites, and brands consumers have yet to discover.
Q: When can I expect my Neiman Marcus Must Have box?
Your Neiman Marcus Must Have box will arrive mid-November or as otherwise indicated in your account. Your account settings will initially display that your box is "processing" after you are billed. When your box ships out, the "processing" message on your account settings will update to reflect your tracking information. Your Neiman Marcus Must Have box should arrive an estimated 5-10 business days after it ships. You will also receive an email with a tracking number so you can follow your package's progress.