It seems there was an anomaly when printing out the CD keys (read: someone screwed up and is going to get shouted at), and '0's were not printed.
The format of the key is XXXX-XXXX-XXXX-XXXX-HH where HH is a hex number and the only place where '0's can occur. So, if you seem to be missing a digit at the end, put a '0' in its place.