Welcome Notice not received - any problem?

Planet3rd

Registered Users (C)
I see many of our friends have received a formal 'welcome notice' after I485 approval. I had my passport stamped on March 24, 2005 (AD 3/16) but not received any such notice. My understanding was that the passport stamp is the evidence of LPR. Could there be any future problem if I do not recieve welcome notice? Any experts to comment please?
 
I thought only people who went for interviews at their local office got welcome notice..
I haven't received mine either...
 
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