The first Box you receive is the one associated to the month you activate your gift card, while stocks last.
For example, if you activate your subscription on March 12th, you will get March’s Box. You have until the last day of every month to activate and get the current month’s Box, subject to availability. The first Box will land in your mailbox within 3 weeks.
However, if the month’s Box is already out of stock, your first Box will automatically be the following month’s Box. You will get it between the 10th and 20th of the following month.