@Niki ********
I believe the last day they are selling the 60 day extension of stay based on unable to travel due to COVID-19 is November 26 (assuming it doesn't get extended).
Different immigration offices have different requirements, but all require the following:
1. Your passport and:
a. a copy of your data ("picture") page
b. a copy of your most recent visa (if you have one)
c. a copy of your most recent stamp
d. a copy of your departure card
2. A TM30, filed in the immigration office.
3. The forms (each immigration office may have different forms, and want to use their special forms)
4. A letter from your embassy saying you can not return, OR a print out from your embassy website saying they don’t issue the letters, OR a print out of a letter from the embassy saying they don't issue those letters. [NOTE the "OR's]. Changwattana *WAS NOT* asking for that proof, but bring it just in case.
5. 2x passport pictures
6. 1,900 THB.