Old and boring: Slap a label on 2 display boxes and ship those things for arrival withing 90 days, in some condition or another.
Today's hotness: Place the display box inside of a shipping box, which is inside of another shipping box "made to fit your order," which is inside of a larger shipping box containing 2 sets of these (because you ordered 2 of them, this is efficient). Slap the label on that thing. Arrives at your door within minutes to hours.
As any gamer will tell you, cardboard armor is lousy. You can't even sell that junk to a vendor.