Same here two 48 oz jars one was opened and they are both on the list.
Hell, I ate some last night.
Just checked at Costco and they have a notice to throw the peanut butter away and go to Costco for a full cash refund.
I just bought two 40 oz jars from Amazon 10 days ago, and an automated email I received from them just says to refer to the FDA announcement, which states to throw it away.
I also checked Jif's website also states to throw it away, with nothing mentioned about receiving a refund.
I get things like this happen from time to time, but in the past retailers would say return product for refund.
While writing the above info, I figured why not submit a return request from Amazon even though their email didn't mention that option at all. So after doing that, the automated message said a refund would be issued to my payment method, and that I did not need return the product.