@Michael *****
To get a 60 day extension of stay based on unable to travel due to COVID-19, you *MAY NEED* need one of the following proofs:
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)
For some immigration offices, you may need to show a ticket out of Thailand on request.