We just have to wait and try not to panic. I work for a school district as well and I'm worried because then they have to put in a substitute, which is never a good thing.
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Date Application Sent -8/18/12
The Lockbox the application was sent to - Dallas Lockbox/Nebraska
Mailing Method (Express, priority, certified) etc. - USPS Express Date delivered - 8/20/12 Biometrics-9/17/12 Approved I-765: 10/31/12 Yay! I821-D Approved 11/1/12