We had one turn up near us here in Samui a couple of years ago. God knows where it came from.
People used to feed her. Then she had piglets. She would lay by the side of the road suckling them, and as they got older, used to take them to a lady who fed them. She could actually hand feed them.
Became a bit of a tourist attraction to see her wandering around followed by her babies. They were around for months.
Gradually, one by one they disappeared. Taken my Myanmar workers apparently, until only mother and one almost fully grown female was left.
Then mother disappeared and the young, by now fully grown female stayed in the same area, and used to approach the same lady for food, or bust open trash bags.
She then disappeared. I was told she died from a pig virus.