what kind notice could it be?

I got a email message from CIS as follows. I will call them later. My question now is what kind notice it could be? Thanks.
__________________________________________
Current Status:

Our last written notice in this case was returned as undeliverable by the post office on November 7, 2005. To update the mailing address so this notice can be re-sent, please call the National Customer Service Center at (800) 375-5283.

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and it is a I-485 case -14948- 給 14948 發送悄悄話 (0 bytes) () 01/04/2006 postreply 17:43:58

回複:and it is a I-485 case -hhyy- 給 hhyy 發送悄悄話 (52 bytes) () 01/04/2006 postreply 18:07:55

The same message in the on-line status -14948- 給 14948 發送悄悄話 (177 bytes) () 01/04/2006 postreply 18:21:33

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