Ben was walking through campus and found a dead body. He reported the body to the police, who identified the body as a 21 year old co-ed, Byrum Robes. Robes had been missing and his family offered a reward of $25,000 reward for info on their sin. When Ben found the body, he did not know of the reward. Later when he found out about the reward, he asked the parents for money.
Do they have to pay him?