I just used the code on a gift box to myself.
Just a reminder... if you don't want to sign up for a monthly subscription, but want the box.. sign into your account and purchase it as a gift. You can have billing and shipping the same as your main account that is closed for re-billing, and send a monthly gift box to yourself. (I just use my other email as the recipient's email). Discount codes work on it too!
/emoticons/
[email protected] 2x" width="20" height="20" /> Then you don't have to worry about remembering to cancel before the next box!