happened to me. NOA1 must have been lost in the mail. I did not file form G-1145 which is the only way to be notified electronically.
See below thread. I emailed the lockbox support and just this week after a month and a week received an emial saying they will mail another NOA1, and also gave me my case number. I have not updated this in the thread. I am waiting to receive the new NOA1 in the mail.
Since after 30 days they had not replied, I Called the 800 number again and after a few tries with the automated system, I could talk to an agent and she gave me my case number.
They usually do not re issue the NOA1, that is what the gal on the phone said, so I was surprised when the person who replied from the lockbox said they would.
Good luck!