Thanks ubonjoe and Pib!
Next Monday I will go to Chaeng Wattana Immigration Office to pick up the Thai Marriage Visa after exactly 30 days from the application. The very kind IO (honestly) who viewed my application a month ago told me that I will have to pick up the result at the L2 counter. Which documents should I bring with me? Do I have to show the paperwork submitted a month ago again? Thank you for your friendly answers. I admire you for the daily information work you do here for free.