How to get an iPhone ready to ship in a trade in kit

What to do before you sell, give away, or trade in your iPhone or iPad - Apple Support

Also, take many pictures of the phone itself and a short video showing it working (the "hello" screen is fine) just prior to putting it in the box and keep them until your trade-in is confirmed.

Review this guide published by Apple 👉 Before you sell, give away, or trade in your iPhone

Axel F.