The only advantage of soured corn over plain corn is that most other animals won't eat it. I think hogs prefer plain corn, but everything in the forest eats plain corn so it's not unusual that the raccoons and deer clean it up before the hogs even find it. If you've got a feeder, the hogs will eventually show up.
There's no magical bait that makes hogs appear. If you haven't baited an area in advance, there's nothing you can do that will assure you of seeing hogs the day/night you arrive.