If you receive something in the mail by accident, you are under no obligation to return it. I would have issued a chargeback given that you never received the item you paid for.
> By law, companies can’t send unordered merchandise to you, then demand payment. That means you never have to pay for things you get but didn’t order. You also don’t have to return unordered merchandise. You’re legally entitled to keep it as a free gift.
https://www.consumer.ftc.gov/articles/what-do-if-youre-bille...