JMS has posted the following message:
Alert from the Babylon 5 Scripts Team: Babylon5scripts.com has adjusted the proof-of-purchase requirement to earn volume 15. The only information buyers will be asked to submit is their order number for each volume. In other words, no one is required to state the unique identifier found on the backs of volumes 1 and 2, (but NOT on volume 3) as formerly indicated on the website.
As a side note, order numbers can be found in the confirmation emails from Cafe Press, as well as the receipt included with each book shipment. If you have misplaced either, Cafe Press will happily give you this information by phone. You can reach them during business hours at 877-809-1659. International customers can reach them via email using the feedback form on their site.
If you have any other questions, please contact the head of the Babylon 5 Scripts Team at email@example.com.
Complete details about the proof of purchase can be found here: http://www.babylon5scripts.com/ProofOfPurchase.htm