In the book found who is chip?

In the book "Found" by Margaret Peterson Haddix, Chip is one of the main characters who is a young boy adopted into a family. He discovers that he was part of a group of children who were mysteriously abandoned and later adopted. As the story unfolds, Chip, along with his friends, embarks on a quest to uncover the truth about their origins and the reasons behind their abandonment. His journey explores themes of identity, belonging, and the search for family.