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If they have already sent a shipping confirmation, there's no way you can stop them. But if you haven't gotten a confirmation, submit a support ticket and they'll be happy to change it for you. I did the same thing with my first pack of guardians
I know with fedex you can actually change the address during shipment and it will get rebounded to the new address with a extra charge of course. I don't know about USPS.
Once the package leaves theory11's warehouse, I would assume it would be difficult to change where the package arrives, if possible at all.
However, for any order related issues, feel free to submit a support ticket directly at www.theory11.com/support. The support team will try to its best to lend you a hand.