KNN from my uncle experience of owning old notes is you will end up not able to use it becos people don't want buy from you and shop don't want to accept it when you use it to buy things and when try to sell to antique shop they will give leesons to short change you eg no envelope etc and endup you will have to travel to mas to redeem but you will lazy to do that and endup it is as good as toilet paper KNN but his was not 500 1k lah KNN