我看到485case日期更新，同時有這樣一段話，請教這是什麽意思？

Current Status: Document mailed to applicant.

On November 5, 2008 we mailed the document to the address we have on file. You should receive the new document within 30 days. If you do not, or if you move before you get it, call customer service.

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我的case:
EB3
PD:2001(substituted)
Receive Date: 08/2007