I just received a letter today saying I will receive my certificate within 10 days. In the meantime, I have to purchase a stamp/embosser and provide the full license # or the last 5 digits, and return an impression of the seal within 30 days of becoming licensed.
The embosser I bought from Engineerseals seems to have broken after a few uses - the top edge no longer crimps the paper as much as the rest of the seal.