Hi this had also happened to me. My AOR letter was sent 8 months to me after they recieved my file. It was suppose to go to TRINIDAD but now this Mexico system is a new thing.You are definitely not alone! My application was submitted at the end of July, received AOR mid November and just recently received an email saying my application was sent to Mexico. I'm at the 7 month mark and have not received any sort of notice of background checks or medical requests.