Apple store
Can I drop my trade-in IPhone in any apple store instead of ship it in the trade kit?
iPhone 11 Pro Max, iOS 15
Question marked as
In most countries yes.
The article...
https://www.apple.com/shop/trade-in
says...
"Just post it off or bring it in.
Return it to us using the pre-paid trade-in kit we send you. Or trade in at an Apple Store.