How do I know ?
Well...some of my friend are working in Airline Industry in Indonesia..and one of my friend friend's happen to see one of the "unreported" incident in Padang and Pekanbaru
There is a thread in local forum discussing about JT, and I must say..those "unreported overrun" is only small pieces regarding JT safety..another one is smoke in the cockpit but didn't declare anything due to "do you want to declare emergency. Descent ? No don't ! It will make us embarassed !" And another one pilots flying above their hours limit of 110 hours..which resulted quite a fatigue...
Cheers