Someone posted in another thread that Apple has never taken trade ins on things like headphones or earbuds, presumably because people would not want to buy these used items all sweaty and nasty from the original owner. So I'm guessing Apple does not want to take in used AVPs for the same reason.The fact that Apple isn’t allowing trade ins for M2 AVP really is concerning.
Apple Trade In
Trade in your iPhone, iPad, Mac, Watch or any other device for credit towards a new one, or recycle it responsibly for free with Apple Trade In.
www.apple.com
The Apple trade in page does not have a category for headphones or earbuds, so that would seem to support this claim.