Receipt Number cannot be found

september142004

Registered Users (C)
My I-485 online status has gone off the USCIS online tracking RADAR since 10/13/2005. Here is the message:

"The status for this Receipt Number cannot be found at this time in this automated system. Please check your case receipt number to see if it is correct. If you have questions or concerns about your case status, please contact the National Customer Service Center."

Could anyone give an explanation please? Thanks.
 
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