Antonio was last seen crossing the U.S. Mexico border. He was travelling with at least one other person in the Box Canyon area, and got sick. He was left by side of road while companion went to town for help. When he came back, Antonio was gone. They had travelled from Magdalena, Sonora, and then to State Route 83 near Sonoita. He was left behind near the Box Canyon area, or the Sonoita highway. (Information retrieved from NamUs.gov)