Originally Posted by
RandyNZ
NZ uses a sticker in the passport for an Indefinite Returning Resident's Visa, so technically he still has that plus the PR entry stamp in his passport (they don't use exit stamps, fortunately). I don't know if they would bother checking with NZ Immigration if the IRRV is still valid or not, that's a good question.
Sounds like this is his only real option with the lowest risk of the two - if he enters MY via SG without any stamps (not sure if MY immigration will check thoroughly on the causeway), they might ask questions, but he can claim ignorance and just show he is a NZ PM and it's doubtful they will check from there.
It might be more likely the local embassy will ask more questions about his PM status or verify it because they are right there in NZ.
This is a hard one to pick, but at least there are two useful options to consider. He is not alone - plenty of MY and SG citizens hold dual, even triple citizenship and successfully hide it from their home governments. I don't know why these two countries have a stick up their rear about dual nationality - I was told I could have problems as a visitor showing up with my US and Canadian passports on my person if they were discovered, even though I would only select one to enter/exit.