Enigma, You don't have to worry about anything. I have friends who faced the same problem. This is what you have to do. Wait for 45-90 days or whatever time they have given you on your reciept. If you still don't get your OPT then GO TO YOUR LOCAL INS office and tell them the situation. Show them your receipt. They will issue you an OPT card. I am NOT making this up, believe me. The rule of USCIS is- once you have applied for anything and you have recieved a notice saying that it will be mailed to you within such and such days then you are SAFE. NO need to worry about 60 days crap. DO AS I SAY.