TBH I called the Registrar today and asked them about how long it takes to receive mail. They didn't give me a clear answer, but they assured me that the application/results process takes a long time / not all the mail was sent out on March 1st so if we aren't receiving everything yet, it's not over and we don't need to be alarmed. I hope that can be of some comfort to you! It definitely was for me. It's not over yet! Don't fret! (My status also hasn't been updated on ROSI/ACORN, so in the same boat!)
Not sure if there are any other applicants applying from abroad, but I also was told that if you have an international address they will also contact you by email. (Makes sense to me.)
Good luck everyone ~