In the replica industry, shipping an item of that size with a designer box drastically increases its likelihood of being detained and seized by customs, so we only ship items below 9″ with their boxes.
Be wary of any site that claims to ship large items with their original box, as this greatly increases the risk of customs detainment. Any seller who promises this is likely not being truthful and may result in your shipment being seized.
A reputable seller in this market will typically ship the item separately from the box, although even then there is no guarantee that the box will arrive in its original condition due to the possibility of damage during shipping.
At our store, our main focus is on providing high-quality merchandise that meets your needs. While the box can be important, it is ultimately the merchandise itself that matters most. If you need a box for your item, they can easily be purchased from other online marketplaces such as Poshmark or Ebay.