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I had sent my OPT application in April 2013, I received an email stating that my application was received by USCIS, but never received the Form I-797 in the mail. After calling a number of times I was told that I should visit my local USCIS office to a request a new letter. On June 11th I was notified my case was denied. After receiving this notice I called a number of times expressing concern about my mail potentially not being delivered and was simply told to "wait until 15 days" as is the policy. June 26th, 15 days after the 11th, after pressing the issue in another call USCIS customer service finally discovered that they had inserted my mailing address incorrectly in their system. By the time I will receive my denial notice (July 6th) it will be too late to reapply.