Weird? GC mailed out only 3 days after approval notice sent out

My GC card was mailed out before I even received 485 approval notice which was mailed out three days ago. This means that I do not even have time to stamp the passport. It is weird.
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The following is the latest information on your case status

Application Type: I485 , Application to Register Permanent Residence or to Adjust Status

Current Status:

On October 18, 2006, the card order was completed and we mailed the applicant's new card directly to him or her. If 30 days have passed and you have not received this card, you may wish to verify or update your address. To update your address, please call the National Customer Service Center at [phone].

If you have questions or concerns about your application or the case status results listed above, or if you have not received a decision or advice from USCIS within the projected processing time frame*, please contact the National Customer Service Center.

National Customer Service Center [phone].

*The projected processing time frame can be found on the receipt notice that you received from the USCIS.
*** Please do not respond to this e-mail message.


Sincerely,


The U.S. Citizenship and Immigration Services (USCIS)