Yes ppl wre right on this topic. If a close rative claims there property stating u are no longer the owner of the property given the fact u have no leagal rights to own property from the day u gave up Nepali citizenship then u are in dodo.right now nrn is still new concept and they havent strickly watched who has foreign passport and who bas not.but its not too hard to implement the check process and no body can say it will never happen.