I know damn well that we have more than that here in New Hampshire. We had some escape after the ‘38 hurricane from Corbin Park (you can google that place up if you want to know more about it.)
About Two Hundred in the whole state of new York is a gut buster, since you only have an inch are so a snow a year there, those little short legged things will do well. If they were in a place where you could use a snow mobile and heavy snow, i doubt they would last long. Good thing you do not have heavy snows in new Hampshire, that makes it possible for them to eat, should have a few hundred thousand in a few years.
I will bet these boar came from Corbin Park. I know some escaped years ago and were rototilling peoples yards near the park. I have eaten them and they are tasty.