Buffalo seems to send aps out when they get a bit backlogged - hence the explanation about "expediting" the case. But I think probably the reality is that too many aps means Buffalo gets backlogged and can't meet the published processing timelines. By disbursing that caseload to the outlying offices, they're able to maintain the published timelines. The reason I think this is because there are no separate timelines published for Los Angeles, Detroit, etc. Their role seems to be to help maintain Buffalo's timelines. I would still figure on waiting between 3-9 months from the date that Buffalo originally received your case.