You carry your work authorization with you? I've heard that its a bad idea to carry it around. It would be a bitch if it got lost.
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Application Sent: 11/23/2012
Acceptance Message and I-797C notice: 12/3/2012
Bio metrics taken: 12/26/2012
Approval: March 17th
SSN: Applied: March 25th. Received: April 1st.