Which store is it?
Also, it will be interesting to see if you receive further communications from AMEX. Obviously if they reach out to you and say that they spoke with the store and the store is willing to make an exception for you that would make it very clear that they were the ones behind this.
Since I was 10 days passed the return window, I called the store to see if they would in fact let me return the item, since I had received a return label from them. They checked and said it was fine to return the item with this label.
I then called Amex, figuring, I want to close this out, so it doesn't appear to them that I returned something that I had filed a claim with them on.
Talking to Amex, they said there is new communication on the claim being sent to me regarding this, but they can't see what it is, and that it could take a couple of days for me to get it. I said, OK, then keep it open and I will see what it says.
I haven't received anything further via email from them as of yet. Perhaps something will come snail mail.
I checked the status on the claim today and it says closed.
Since it is now closed, and I assume therefore not still being investigated, I will bring up the name of the store. It was New Balance.
Perhaps Amex called them regarding the return which caused the store to take the action. I don't know, but I will update if I receive anything further from Amex regarding this.