https://www.google.com/search?q=found+db+cooper+money&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwiEjJb_jKPVAhXpjFQKHWIBC5oQsAQIUQ&biw=1280&bih=855&dpr=1



(from Wikipedia)
In February 1980, eight-year-old Brian Ingram, vacationing with his family on the Columbia River at a beach front known as Tina (or Tena) Bar, about 9 miles (14 km) downstream from Vancouver, Washington and 20 miles (32 km) southwest of Ariel, uncovered three packets of the ransom cash as he raked the sandy riverbank to build a campfire. The bills were significantly disintegrated, but still bundled in rubber bands.[78] FBI technicians confirmed that the money was indeed a portion of the ransom—two packets of 100 twenty-dollar bills each, and a third packet of 90, all arranged in the same order as when given to Cooper.[79][80]

Great post!