sdf, thank you very much for your reply. Actually i did not receive any mail with receipt from them. When i filed my application, at the same time i got a very small piece of receipt that shows my application time, A#, name, and fees i have paid. there is a "official document" on the bottom. there are some other characters and No. on it, but i don't think it's continuous 13 character case number. Normally how long will i get the case No.? thank you very much again.