Maungatautiri is a failure and a massive and very unpopular burden on Waikato Regional ratepayers who have been forced unwillingly to bail it out several times now.
Zealandia is also a failure and famous for it's poisoning of trout by use of Rotenone placed into the streams. Incidentally some of the green extremists want to see Rotenone (derris dust0 used in waterways emanating from national parks in order to eradicate those pesty trout.
I cannot comment on Orokonui an=s I don't know it.
Shakespeare park in Auckland is another example, but rats are reinfesting by swimming around the fence. Ulva island is another example of a place where trapping was successful but not maintained so a great excuse for DoC to pour brodifacoum onto the place. IMO to create a precedent leading to intended complete poisoning of Stewart island. Rats are still swimming to Ulva island.
Sanctuaries are a reasonable step off starting block but trapping and or target specific well maintained bait /trap stations can be effective for possums, mustelids and rats, mice. This has been proven long term (18 years) in Northern Urewera.