Do you have to include your watch band with your trade in?
I thought that I might trade in my watch but would like to keep the band. Is that allowable with a trade in?
Apple Watch Series 3, watchOS 8
You can keep the band. See the following from Apple Trade In - Apple
Do I need to return accessories to get the full trade-in value?
You don’t have to, but you can always return your chargers, cables, cases and watch straps, and we will recycle them responsibly. However, if you cancel your trade-in, we’ll be unable to return them to you.