It's not BSF, but I saw a wild hog just outside of Gatlinburg in the Smokies earlier this year.
A buddy and I hiked from the Elkmont Campground to Clingman's Dome and then back down by Sugarland Mountain. We wanted to do it in a day, so we hit the trailhead at 3:30am. On our way into the campground, we were driving along the Little River and there was a hog just to the side of the road, super visible.
Once we got on the trail, we used headlamps for the first four hours or so, as it was pitch black along the bottom of the holler. I wasn't worried about running into a bear but I'll tell you, I definitely thought about running across a hog in the dark.