I recently found a couple of 25 odd year old piggy banks in my garage. They're mostly full of 5 cent coins (no longer legal tender) and lots of the old big 10, 20 and 50 cent coins, along with a few oddities like some old shillings, old aussie, saffa and US coins, etc. I'll probably look for a coin collector or numasmatic dealer (new word of the day:D) for the oddities, and I'm assuming all the NZ 10, 20 and 50 cent coins can still be used despite looking huge compared to current ones? But what's the deal with the 5 cent coins? Will most banks exchange them? I see I can send them to the Reserve Bank but would prefer to pop into a local bank than courier...