It's a joke. One guy told me he paid an agent in Pattaya, who took him to the bank which had an immigration officer present.
Think I'll write to my old pal who was Finance Minister and who helped me get interest from a bank that didn't give interest to foreigners. He caused quite a stir when he shared my photo of a tip box in Khon Kaen immigration on his public Facebook page.
Immigration are part of the Royal Thai Police and when they are breaking the law, accepting bribes, intimidating honest foreigners to use agents, etc, the people want to know and stop them.
Ever wonder why agents don't have a Web page?