My first "border-run" to Cambodia was April 1999. The few Cambodian border guys were thrilled as they could supply their families with food and shelter, as opposed to the rest of the Cambodians. Passport "irregularities" were ignored.
At that time, I have seen Cambodian women crossing the border with their 3 children, without any Thai-Papers. They had to pay their way into Thailand by offering their charms to Thai Border Officials. That was in the early days, a long time ago, in 1999. After this ordeal, those women ending up in Pattaya, were better off in Pattaya than in their home country. As so many women originating from the "poorhouse of Thailand" , that we call "the Isan".