In my application I submitted a copy of the original marriage certificate signed by my wife and myself and showed the original certificate.
I had brought an updated Kor-Ror-2 in case they asked for it but I did not need to show it.
I also applied on Wednesday for the same visa with the same papers and had the same experience, it was a very easy process.
The guy ahead of me in the queue also applied for non-o multi entry but he did not have proof of funds and they gave him back 3000 bath and told him single entry only.