Thanks for the reply. In what office was your case processed?...for those having similar problems, I contacted my jurisdiction's office and they mentioned that even though "decision was mailed" was posted on USCIS case status, that is usually an automated message and doesn't strictly mean the decision was actually mailed — it means it could have been mailed or in the process of being mailed; that's why some people get the decision a couple days after the updated status is posted, while others receive it several weeks later.