Guys, I dont know whether you have gone through this situation or not but I had applied for OPT couple of weeks back and was supposed to receive Action letter from USCIS acknowledging the acceptance of my application with case number and so forth. Unortunately, the letter came and returned back. I had given the address that I am going to move after a week thinking OPT will take at least 2 months to come and by then I'll be in that address. I had no idea that USCIS also sends Action letter.USCIS send me the letter, but the current tenants didnt recognize the recepients name and returned it back. I have no idea what happens when these govt letters return back to them.What you guys say?Is this a serious problem? Is it possible to request for the another attempt?I'll be in the address given to USCIS from this friday. Thanks in advance for suggesting and sharing your experience.