Harry lost his new pet dog, a black-and-white Shetland sheepdog. He put up notices around his estate stating that he would give a reward of $200 to anyone who finds and returns his pet to him. A few years passed by with no results. Harry then just gave up hope that he would find his pet again. After 7 years, May brings a haggard looking black-and-white Shetland sheepdog to Harry and claims the reward.

Using relevant principles of contract law, was Harry obliged to pay the reward