I've used Nuoc Mam, a Vietnamese condiment (smells like rotten fish guts). You can find it at any old school Oriental market. Warning! I had a bottle leak in the back of my Jeep, stank for months.

The last time I used it there was whole sounder rooting around where I had spread some the day before. I spread it on a game trail they used hoping to get them to stop and investigate long enough for a shot, worked out fine.

You can let it drop by drop across a likely path (maybe a hundred yards wide) and then dump the mother load. This stuff really stinks if you get the good stuff, a little goes a long ways.

If they are anywhere around they are likely to come investigate.

They used to have a law (the Greens pushed through) forbidding baiting Hogs here with Corn (repealed it after a couple of years) we had to get creative.