"What you do is, drop the items off, then the host ends the game. As it saves, [the visitor turns] off the wireless via switch on 3DS. Bam. Duplicated. Cloned."
PSA: This might be a good time to remind everyone that you can filter stories here on the site, especially if you are hoping to avoid spoilers of a Hyrulian nature. This is available only to registered members.
Edit Profile > Custom Filters > Games Type "breath" or other keyword to find a game, and make sure it says "Exclude".
Bam. Media blackout on that until you tell us otherwise.