Once we post a notification on our website that the boxes are sold out, you will receive the next month's box if you sign up afterwards.
Please check the list of sold-out dates on our Shipping Schedule page.
If you place your order after the "Sold Out" date, then your box will be the next month's box.
This is different from the official shipping date. The listed shipping date is when the current month's boxes are first released to the public. We will still continue to fulfill and ship the current month's boxes until they are sold out. Sometimes we sell out before the official shipping date, so there are no additional shipments after the official ship date. We try our best to avoid selling out prematurely so that everyone can enjoy our boxes. :)