Mary lost her backpack.She posted a note at the entrance to the bookstore saying:"Reward:$100 to anyone returning my back pack with all of the contents."

XXX found the back pack, called Mary, and met her to return it. All textbooks were there except the ever popular and coveted "Law and Society" textbook along with the even more highly coveted copies of the flashy and interesting class PowerPoints from Prof. Bastian's class.Mary refused to pay the $100.

(1)What kind of contract is XXX trying to enforce when he sues Mary in Small Claims Court?

(2) Will XXX recover for breach of the contract?

(3) If you believe that XXX will not succeed for breach of contract, is there any theory available to him to recover something?