When Shelby Bonnie’s iPad went missing, he tracked its separate itinerary and entertained his followers with its whereabouts. When Shelby Bonnie’s iPad went missing, he tracked its separate itinerary and entertained his followers with its whereabouts. Last month, Shelby Bonnie’s iPad vanished from his carry-on bag somewhere at Fort Lauderdale-Hollywood International Airport after a red-eye flight from San Francisco. He figured he would never see it again. But sometimes our devices aren’t ready to say goodbye. While Mr. Bonnie, an investment banker with Allen & Company, continued on his way to the Bahamas for a few days of relaxation, his...