@Al ********
actually in Bangkok you file TM30's at the Muang Thong Thani Immigration office.
Bangkok was one of the offices that tried to follow the "only when returning from international travel" policy but some people got called out for having a TM30 from hotel inside the country and not re-filing, so I dunno what to tell you other than when you file a 90 day report or when you go to get another extension they'll let you know.