When you photocopy, it doesn't copy properly and the highlighted bits are dark shaded. Australian passport control nearly wouldn't let my friend on the plane. It just takes one immigration guy.
I tried to do the social letter after my first extension and it was voice recorded. I have e years of understanding visa and work permit processing for up to 170 volunteers. The processes change all the time and this was last year's process. It regularly changed and will always regularly change.
That was the process last year with Chiang Mai social department. Other places may be different. I have heard you don't even need one extension in Mae Sot from a friend's foundation.