My understanding is they will contact you after a month or so and ask about when you plan on shipping them. When the last purchase has been moved from En Route to Box status to In Box status. So if you keep buying and keep having cards in the En Route to Box account you should be able to keep them there for some time. I though I seen a statment asking you to have them shiipped after a month or so. Could not find that sstatment today maybe I was dreaming.
I have been waiting 2 weeks for one seller (out of 12) to show up in In Box. i have sent messages to both Sportlots and the seller. Just waiting for replies now. I do understand this is a issue with doing the Box.