I sent my OPT extension request to the wrong filing location (Phenix, AZ). I should have sent it to Dallas, TX. I am very very tense as I am not sure when USCIS will return it to me. My OPT expiration date is 8/31/2012, actually it has been expired already. After USCIS returns the document to me, I send another application to TX, the request date will be definitely beyond the OPT expiration date of 8/31/2012. So, in this case, will Dallas TX service center consider that I do not send my OPT extension request before my expiration date and therefore reject my case? However, I indeed sent it, but to the wrong address. Can I provide the evidence such as the copies of delivery confirmation and envelope to Dallas TX to show that I indeed had sent my OPT extension request before my OPT expiration date? I am so worried and hopefully someone with similar experience can help me on this. Thank you very much.