I'm not gp111, and definitely not a guru; but I'd read something about this in another thread, so I think it might help.
I understand that once BEC receives the letters in return, they have a team which will start processing the applications, again maintaining the same order (PD) used while sending out the letters. I understand this team - which will look into your application - is currently also used to help generate the 45-day letters, but once BEC starts receiving the 'YES Continue' letters, this team will be pulled in to do the certification task.
At least, that's the plan as was discussed in the "BEC Philadelphia" thread (
http://www.immigrationportal.com/showthread.php?t=149224&page=6&pp=15). With DOL & BEC, you never know !!