I was also able to add a ticket this year. Rather than wait for them to call me I called them and asked if there were any tickets around my current one's. There was a single a few seats away from me that I was offered.
Exactly. My Rep. told me that after they tried to "relocate" the missing 1200, there were only single seats left. They said they called the Season Ticket Holders that were closest to those singles to see if they were interested.
I still think they should have done this in order of seniority, for those that requested extras.