Several years ago I killed a couple of hogs in crawford county. I was targeting them exclusively in the springtime. I had a group (sounder) come into about 50 yards in an open pasture. I was able to take the one I wanted first, then after the first shot they all ran like hell, I shot one more, then it was over.
I did all the online research, emails to the bios and warden, put in plenty of bartime, drove all over, and knocked on lots of doors. I did get permission from one nice farmer who never once saw a single hog on their farm. But I took them up on the kind gesture and scouted, walked and hunted hard. They payoff came at 8:45 pm when the hogs came out. I chalk it up to being at the right place at the right time. I called Dave Matteys that night and he said he'd come out in the morning for a blood sample, which he did. I'm surprised Dave was quoted in the link that there's only 20 or so hogs left. Anyways, I won't give out the farmers name or local, but its in the 5 mile radius. There is also some public land, but I never saw any sign of hogs in there, but who knows. The dept of ag was trapping them but I don't know how well those efforts were. You will need a small game licence. Good luck.