This happened to me a couple weeks back. I ordered a copy of the Gin Blossoms' Congratulations I'm Sorry and the box arrived with a second sealed mailer that had "Congratulations I'm Sorry" on an address label on it (which I found strange from Amazon). Opened it up and it was a not great looking copy of Marvin Gaye's In Our Lifetime. Chatted with Amazon and they wanted me to drop it off at a UPS store before they would mail a replacement; I told them that was inconvenient and they wouldn't schedule pick up so we fought for a bit and they just sent a replacement. I then had to do a second customer service chat because they charged me for the replacement as well.
I'll echo this. Admittedly, it's rare, but we all know Amazon really isn't checking these returns and I am stunned it doesn't happen more often. I think I got some Yungblud live album instead of a Joan Jett Warehouse record I ordered. I know anything I've returned could have been substituted with something less good in my collection and I'd probably get the refund from it, especially if I opt for credit over cash.