Interesting. For my courses, it usually says something like, 'exams left until next shipment' and then provides a number. Shipments usually get sent when I have about 2 exams left.
Regardless, if you want to avoid wait times for all of your other classes, fill out the waiver form and return it. Since you are paid in full, this means that they'll send out all your books at once. The form can be found with all the other electronic documents (this may vary depending on which website layout you have).