In 1981 a human skull was unearthed along the same riverbank, during excavations in search of additional evidence. Forensic pathologists eventually determined that it belonged to a woman, possibly of Native American ancestry.[4]

In 1986, after protracted negotiations, the recovered bills were divided equally between Ingram and Northwest Orient's insurer, except for 14 examples retained by the FBI as evidence.[60][77] Ingram sold fifteen of his bills at auction in 2008 for about $37,000.[78] To date, none of the approximately 9,700 remaining bills has turned up, in hiding or in circulation, anywhere in the world. Their serial numbers remain available on-line for public search.[79]

In 1988 a portion of a parachute was raised from the bottom of the same stretch of the Columbia River, but FBI experts determined that it could not have been Cooper's.[80] In 2008, children unearthed another parachute near Amboy, Washington, about 6 miles (10 km) due south of Lake Merwin, which proved to be of World War II-era military origin.[81][82][83] The Columbia River ransom money and the airstair instruction placard remain the only bona fide physical evidence from the hijacking ever found outside of the aircraft.[84]



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