What methods do the townspeople and the real brothers use to try to catch out the conmen?

Harvey Wilks then remembers that his deceased brother had his initials tattooed on his chest and challenges the King to tell him what was on Peter's chest, assuming that the men who had laid his brother out would have seen the mark and will be able to determine who is lying. Refusing to give up, the King continues pretending and tells them Peter had a blue arrow tattooed on his chest. The men who laid out Peter Wilks cannot remember seeing anything, and thus they are forced to exhume the body.