Calling is the way to go, but be prepared for all kinds of answers.

On Tuesday I called and asked about moving my dates slightly and at that time the agent said the certificate was attached. Then today I called to move the dates by two days and the agent had no idea what I was talking about. She had never heard of Travel Packages or 7 day certificates. After contacting a supervisor she said there was a 45,000 point award, but no certificate that she could see. She said perhaps people with "more advanced access" can see the cert. In any case, I did successfully change the dates, but I will be surprised if check-in goes completely smoothly. Crossing my fingers...