Some conflicting opinions / experiences I’ve read here.You have to ship it back to Apple they'll send you a box. At least that is my experience when i wanted to give it back in the store i was told i can't
If I order ship to Apple Store “unconnected “ I was under the impression I can trade in my iPhone 13 PM when I pickup my iPhone 14 PM. I’m fully aware that my bank gets charged the full amount.