Just after having a baffling experience in Rach Gia's Superdong ticket office. Went in, after having done a serious amount of research into the area, looking to get a ferry to the lesser known Nam Du rather than Phu Quoc.
A very disinterested lady informed me that tickets were "sold out" for tomorrow. Okay, I said, let's do the day after tomorrow. No dice. I whipped out my calendar after a few minutes of her pretending not to see me and asked when I can buy a ticket. "Sold out, sold out, sold out..." was her response. "Never?" I asked. "Maybe" was all she said back to me.
It was only after a while of standing there that I finally got the real reason why the tickets were apparently sold out. She said that the police don't accept tickets when foreigners present them. Essentially, the island is now off limits to westerners. Whether it was an off day for her, or a new policy, I'm not sure but I'm sure you can understand my disappointment and I thought others should be aware.