First, you’re going to need to have two Joy-Con controllers and at least three players registered on your island — yourself and two others (Benjamin’s video calls them Mr. A and Mr. B). You also want to have their mailboxes close to your Resident Services plaza. Go to the airport and send 1–3 things that you want to duplicate to one of the extra player characters, then head to the mailboxes and wait for the mail to arrive.

Use your NookPhone’s “Call Resident” app to call Mr. A. Connect your Joy-Con controllers and shake them to make Mr. A the leader. Using Mr. A, go to the mailbox and quickly take the presents from the mail, then open them and drop them on the ground. Shake the other controller to make yourself the leader again, then press + or – and choose “Pick residents again.” Choose Mr. B this time.

Connect your controllers, then immediately press + or – and pick “End Session.” When you go back to the mailboxes, you’ll see the dropped items on the ground, but they’ll also still be in the mailbox. Double the items. Party time.

This glitch allows you to duplicate anything that can be sent in the mail — that includes Nook Miles Tickets, which have quickly become the currency of choice among people who do online Animal Crossing trading. So if you truly need Raymond to live on your island (and you don’t have the patience to just find him yourself on a mystery island), this glitch might be the way to make that happen.

Of course, Nintendo has already patched several duplication glitches, and this one will be patched soon, too. If you’re planning on taking advantage of this glitch, you’d better do it soon.