End of the month – Cut off for the next shipment.
4th of the month – Shipping Date
11th of the month – Renewal Date
We ship the month of the 4th of the intended month. The March box would ship March 4th. The May box would ship on May 4th.
Sally signed up for the Grand box on March 1st, past the cut off date for the next shipment. (the next box shipping would be the March box) Since she missed the cut off she would receive the box after the next one, which would be April.
Sarah signed up on March 20th, which is before the cut off day of the next shipment. She would be getting the next box, which is April.