@Roland ********
the people down on the "islands of misfit toys" :O (Koh Phangan, Koh Tao, etc) had a special deal where they didn't have to go and get the second stamp. Although many of them did go "close the loop" anyway..
That was NOT something other offices were extending to people who used the embassy letter to get emergency extensions.
I can see by the O/P's stamp they got it in Bangkok, so I suggest they go back to the immigration office and check.
There are conflicting stories about what (if anything) will happen if they don't get the second stamp.