17th of the month – Cut off for the next shipment.
21st of the month – Shipping Date
28th of the month – Renewal Date
We ship the month prior to the intended month. The March box would ship in February. The May box would ship in April.
Sally signed up for the Grand box on March 18th, past the cut off date for the next shipment. (the next box shipping would be the April box) Since she missed the cut off she would receive the box after the next one, which would be May.
Sarah signed up on March 15th, which is before the cut off day of the next shipment. She would be getting the next box, which is April.