How does Billy finally obtain papers of ownership for the stolen horses?

When the boy catches up with Billy and Boyd, he has some vaqueros with him. Billy produces papers of ownership but the man keeps the papers and demands the horses back anyway. Boyd seems on the verge of refusing to return the horses but Billy tells him to release them. Boyd and Billy follow the horses. They then encounter a man who seems to be in charge. They tell the man about the theft. He takes them to where the herd is being held. The man tells Billy to take their horses and Billy asks for a paper of ownership. The man writes the paper and hands it off. Billy tells Boyd that he believes the papers will protect their ownership while on that property but probably won't be worth anything later.