As a rule,
@So***
you can't do a 90 day report at an office you don't have your extension from. (It can't hurt you to go to that immigration office and check though, but it's unlikely you can file one there)
You can apply up to 7 days after the due date in person without getting the failure to file on time fine.
After 7 days the fine is 2000 and it doesn't go up, so if you can't make in back up to bangkok to file within a week just go when you can and be prepared for the 2000baht fine.