Mt Riverview responded to a call for A young boy who went missing near Lapstone on Saturday 5th Novermber 2005. Four-year-old Isaac was located in bushland shortly after 6am by his father about 200m east of where he went missing. Isaac was last seen by his friends and family about 6.30pm Saturday while bushwalking with them at Knapsack Bridge, near Lapstone. The search for the boy involved more than 100 personnel including Penrith and Blue Mountains Police, the Dog Squad, Police Airwing, Rural Fire Service and SES.