I called the web-support line to verify that the number was invalid. They confirmed that it was invalid, and I called Chase customer support. They told me that I should get another certificate in 5-10 business days. If someone is guessing the e-cert numbers, hopefully they can put a stop to this. United should inbed some type of cypher secret into the e-cert numbers to prevent any type of fraud. I know quite a few of the numbers on this Chase e-cert matched an e-cert I got from United.