If the box misses
Wrong edition, a double gift, or the table just did not take to it. Here is where returns actually happen.
Through the order page
The box was sold on the listing, so the return goes back the same way. Open the order in your account over there and the return option sits right on it, with the deadline and the condition rules printed next to it.
What the rules usually look like
Card games generally travel back unopened within the stated window; an opened deck depends on the current policy for the listing. The order page states what applies to your box, and what it says beats anything we could summarize here.
Please do not mail boxes to Madison
Our address takes letters only. A game box sent to the work table cannot be processed there and will not count as a return anywhere; it would just be a lost box.