I told them, and they said they'd refund it, don't need to send it back, and they'd even add $15 credit.
The refund never arrived so a few weeks later I got in touch again and they said I need to send it back if I want a refund. They told me the previous CSR had lied to improve ratings. I asked who I can complain to and they said nobody and closed the chat. I reopened it, restarted the refund, it was accepted and then 2 hours later I got an email saying that unless I sent them ID my refund would be rejected and that I can "no longer contact them" about this refund. I ignored that email, sent the book back and got the refund.
Another time I bought a Samsung Fold and it cracked down the middle. I told Amazon and they said they'll refund it under warranty. I sent it back and got a warning that if I return anything else in "non original condition" I'd be banned. Even though it was a warranty return.
That level of service would have been totally unheard of for Amazon 5 years ago.