I once went to immigration for a 30 day extension on my 30 day tourist visa and I did not have a TM-30 because we were staying in my Thai wife's apartment. Lady at the desk asked for the TM-30. My answer was "Do not have one. She helped me fill one out with a few questions from my wife and 30 day extension was then granted. That was in Chiang Mai one year ago
had a K1 visa in process but unknown delays cause me to fly to Bangkok to find out why. Day after arriving Got a email from the embassy that they canceled visa and destroyed documents. Hired Siam legal and 30 days later we were on a flight back to America
i was once asked about this at the ticket counter. She kept asking about my return and kept explaining why not for i had to deal with immigrations delays at the Bangkok Embassy. The line behind me continued to get long so she finally let me board