Another theme could be redemption. Maybe someone made a mistake and lost something valuable as a result, like a friendship. But through a series of true - life events, they are able to find a way to redeem themselves and regain what was lost. It could also be about the theme of discovery. Losing something can lead to the discovery of new things, new people, or new aspects of oneself.
Well, it could be a story where someone loses their way in life, perhaps due to a difficult situation like an illness or a job loss. And based on true events, they manage to find their purpose again. For example, a person who was injured and couldn't work their normal job, lost their sense of self - worth. But through real - life encounters and self - discovery, they found a new passion and a new way to contribute to society.
I'm not sure which specific 'Lost Boy Found' true story you are referring to. There could be many stories with such a title. It might be about a lost child who was finally found, perhaps lost in the wilderness and then rescued, or lost in a big city and reunited with his family through some series of events like the help of kind strangers or the work of the police.