4 year old Rilya Wilson disappeared from foster care in early 2001. It was over 15 months before it was discovered she was missing. 

https://www.flsenate.gov/Media/PressRelease/Show/4113

https://charleyproject.org/case/rilya-shenise-wilson

https://miami.cbslocal.com/2013/02/12/geralyn-graham-to-be-sentenced-in-rilya-wilson-case/

https://miami.cbslocal.com/2012/12/17/key-prosecution-witness-takes-stand-in-geralyn-graham-trial/

https://miami.cbslocal.com/2012/12/11/more-testimony-tuesday-in-rilya-wilson-murder-trial/

https://miami.cbslocal.com/2012/12/10/rilya-wilsons-sister-to-attend-graham-murder-trial/

https://www.sun-sentinel.com/news/florida/fl-nsf-rilya-wilson-20150311-story.html

https://miami.cbslocal.com/2012/12/05/testimony-to-resume-in-case-of-rilya-wilsons-death/