I basically oversaw the entire process and was as in-their-face as I could be. Maybe try going to the seller's attorney's office? My biggest fear for you (having once been dealing with a seller's attorney who was a total sketchbag) is that the attorney for the seller may have been a scum who did not hold the check in escrow, but deposited it illegally or something.
Keep on them - I am not a big advocate of the real estate practioners 'be patient' mantra, because I dealt with way too many people who just want to sweep things under the rug. This city is filled with dirty lawyers and brokers, and Southeast Queens is a living testament of that for us.
You are posing some good questions that would best be responded to by an attorney.
Consider visiting http://www.linkedin.com. It is a resource that various professionals use to publish their availability. It is unique because it allows people that have used their services to provide comments on the level of service they provide.
It might be worth a look.