Could be, that soil looks like it's hard and Hogs can be notional. I've seen them favor digging up the mound running down the center of a dirt road. I have no idea what's in those mounds that attracts them?

I dig a little hole, put a handful of corn in there and cover it with a good sized rock. I scatter them around some.

Put up something that throws out a good scent cone, rotting meat or whatever.

Pigs are Gypsy and covering ten miles a night isn't at all unusual. Sometimes they just disappear for months. Boars are often loners and may pop up anyplace at anytime.

It is easy to tell when the Hogs have been in a pasture or Meadow, with hard pan it is harder to tell.

What do you have to loose by trying to find out for sure and/or maybe draw some Hogs in that are passing through.