Many Reddit users report receiving $10.xx checks for money owed to them as being American Express Business cardholders. Apparently there were $10 wireless credits not paid out and these are being sent out with interest. Some speculate that it has to do with credits not posting for Google Fi purchases, but no one seems entirely certain exactly what these are for. Others think this is for missing Entertainment credits instead.
Some people got $20.xx check or $30.xx checking, possibly for some months combined. Others even got a dozen or more of these checks. It’s been sent even to people who are not aware of any missing credits, so keep an eye out and don’t throw out the mail too quickly.