Sources:

Steven Stayner
https://en.wikipedia.org/wiki/Steven_Stayner#Later_life_and_death

Timothy Carney
https://charleyross.wordpress.com/2012/03/07/annnnnd-more-info-on-timothy-carney/

Nguyen Thi Van
http://english.vietnamnet.vn/fms/special-reports/24970/woman-returns-home-after-21-years-going-missing.html

Gabriel Nagy
https://list25.com/25-missing-people-that-were-mysteriously-found-alive/
https://www.couriermail.com.au/news/gabriel-nagy-comes-home-after-23-years-lost/news-story/a5c23dd693919a734d46ccc1a6825d2c?sv=ccd7ef8e96d5381a658646ebdf1fc60d

Shawn Hornbeck
https://www.babygaga.com/15-missing-kids-discovered-alive-years-after-they-vanished/
https://en.wikipedia.org/wiki/Shawn_Hornbeck_Foundation#Prosecution
https://en.wikipedia.org/wiki/Michael_J._Devlin

Michelle Knight
https://en.wikipedia.org/wiki/Ariel_Castro_kidnappings

Carlina White
https://en.wikipedia.org/wiki/Kidnapping_of_Carlina_White

Tanya Kach
https://en.wikipedia.org/wiki/Tanya_Nicole_Kach

Marina Chapman
https://en.wikipedia.org/wiki/Marina_Chapman

Elisabeth Fritzl
https://en.wikipedia.org/wiki/Fritzl_case