When I talked to a Photopass CM last year in the parks, they told me that the 30 days was a "loose deadline." and that in most cases the pics would be there for significantly longer time.
In order to save server space on their website, they delete the oldest pictures on the server first. They tell you 30 days because they can guarantee that.
Check your account and see if all your pics are there. They probably will be. Then just order the CD, and you'll be fine. If they are not all there, then call the number provided by a PP.
Many of my pictures were still on the Photopass website months after our trip last year, even though they "expired" after 30 days.