I mailed ours to the Chicago lockbox too, ten days ahead of you, also forwarded to the National Benefits Center (MSC), and we did biometrics the day after we got the notice. Go figure!
I wonder if they are just shuffling them up and processing them out of order. Not that we can complain yet, since our scheduled FP date is not even for another two days, but yours went pretty dang fast. Also, what ASC did you do the FP at?
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USC filing for spouse
6/20/09: I-130, 485, 765, 131, 864 filed
6/23/09: Package received at Chicago lockbox (RD)
6/26/09: ND
6/29/09: checks cashed
6/29/09: NOA received (MSC-*)
7/1/09: Receipts online
7/1/09: FP notice date
7/6/09: FP appointment received
7/7/09: FP done early (walk-in)
7/29/09: FP scheduled date