I prepared the application myself and dropped it off at the San Jose INS office. San Jose doesnt assign WAC#s. So on my encashed check they had put my new Alien Number.
Did you write the check to INS or did the attorney send his own check? In either case, i am sure you will be able to get some information from it. If you wrote it, all you have to do is to go to your bank and ask them to see the check. If your attorney wrote it, I guess you can ask them to contact their bank and get the information.