I did not send the refund. My banker verified that the McAfee check was legitimate and he handled it.
I can only speculate that Carlos meant to refund $31.00 and was incompetent!
He wasn’t incompetent, that’s part of his scam. He “accidentally” refunds you too much then demands that you give him “his money” back. Of course the refund is a fake check, so you send him real money and his check bounces and you have no recourse.