Mine was on the longer side as well, I remember being one of the last on the Feb sheet to receive AOR and was also only given a temp number and the CIC agent was telling me the same as you. Then one day I got AOR, SA, bio, med request and a status update that they were working on the background check all within 24 hours! Dont lose faith it will come. If they were going to send it back they would have by now.