For me, I will take the same trap that caught the boar and set it just a short distance out from the circle, if and or when the catch dies off and will catch sows and first-year coon in that trap. I have no proof, but I believe it is all the boar smell at the catch spot that alerts the sows and younger coon. I personally never clean my traps just reset them. I have even taken that trap, dig it in and not rebait it, just whatever smell is in it and have coon that was rejecting it get caught when I do that.
We all have heard about the boar killing pups, and I have seen the aftermath of the killing sprees many times with the customer telling me the sounds scared them so much they wanted to leave the home when happening up in the attic at 1 am in the dark lol. This past spring I actually went into an attic and witnessed it happening first hand. Pups were dead all over and the sow was fighting the boar to try to save the last pup that was already dead. I went up through the hatch and will confess thinking do I really want to do this with the sounds that was coming from up there. I popped up through the hole as fast as I could, as I did not want my head in a bad place LOL The sow and boar was rolling and the sow was getting the best of him, I startled them and the boar took off away from me, and the sow came right after me. I had to hit her with the pole snare at 2 feet to keep her from getting me LOL I am telling this because the first 9 months of those young coons lives, the sow is training and protecting them from those older boars. So my thinking when those older stinking boars spend that much time in the trap, there is a lot of smell concentrated at the one spot, the sow will avoid it as much as she can and she trains her young to do the same. Barren sows and 2-year-old boars have a different attitude and I think have no problem at those catch circles or very little problem anyway. I see this same behavior with cages that have caught older boars. Move the cage and I catch the coon. I believe there are other reasons why coon rejects the trap but will not write a book.