Study each of the following case carefully. Briefly state the principle of law and your decision.

Hollander purchased a computer from a pawnshop for use in his real estate office. Several weeks later, Diem, one of Hollander’s customers, mentioned that the computer looked familiar and asked if he could examine it. After checking the underside of the machine, he pointed to his Social Security number, which had been engraved on the metal frame by his insurance agent. Diem demanded the return of the computer, claiming that it had been stolen from him and that he could produce the original sales slip.
a. Can Diem legally recover the computer if he could prove that it had been stolen?
b. Can a rightful owner be estopped from recovering his or her property from an innocent purchaser?
c. Could the pawnshop have given good title to Hollander?