View Comments The case of an El Paso boy missing for 10 years in a parental kidnapping case is being highlighted on digital billboards. A billboard showing an artist rendition of Steven Campbell age-progressed to 12 years old was unveiled Tuesday near Hawkins Boulevard by The Fountains at Farah shopping center. The billboard was unveiled in recognition of National Missing Children's Day on May 25. In July 2011, Steven was allegedly abducted at the age of 3 by his mother, Karla Campbell. They could be in Mexico. Karla Campbell is wanted on a U.S. federal warrant on an international parental kidnapping case, officials said.