Honestly Ken, I think it’s too much hassle for you and for them. My experience on the odd occasion when I’ve received a duplicate order is that the firm doesn’t really care whether they get it back or not. To them, it’s just one of the screw-up’s that happens once in a while. Cost of doing business. That seems to be the vibe you’re getting from them.
But I wouldn’t sell the recordings, either. Gift them to a jazz- loving friend.