emails/LUD changes by USCIS years after I-485 approval?

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Registered Users (C)
My I-485 was approved at an interview 9/7/2005 and I received my plastic card about a month later.

This year I've received several emails from USCIS regarding old cases. Is this anything to be concerned about?

For example, prior to my successful case, I filed an unsuccessful EB-2/NIW package with I-140/I-485/I-131/I-765. All petitions were denied on 3/29/2004 and I received denial letters via my attorney at that time. The online case status, however, still said 'pending' until 8/12/2007 when I got an email from USCIS on the I-140 and I-131 petitions, saying a decision was mailed on 3/29/2004.

Then on 11/4/2007 the LUD for my successful I-140 petition was updated, although the online status still says 'approved' as of 3/16/2005. No email was sent on 11/4/2007, though.

Finally on 12/2/2007 the LUD for my successful I-131 petition was updated, although the online status says 'approved' as of 9/1/2004. I received an email on 12/2/2007 advising me of the approval--although I received and used the AP in 2004-2005, no email or LUD change occurred in 2004 on this case.

On the other hand the LUD for my successful I-485 petition and for my I-181 have not changed since 2005.

Would there be any reason for this online activity years after the fact? Any reason for concern?
 
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