A zac. 5c. 1 and 2c coins were removed from circulation when the value of the copper in them threatened to exceed their face value, so 5c is the smallest Australian coin still minted.
A dime. Most members of my family have come to accept that they are left for us by deceased family members. My siblings were finding dimes and attaching a meaning to them which they only shared with me when I casually commented that at one point I was finding them all the time. They never said anything to me before that because they know how skeptical I am about such things. I will never be 100% convinced, but I will share one anecdote that illustrates why they might be right. Keep in mind that I do not carry coins in my pocket and have been very careful with dimes so that I know that I am not finding my own dimes. A short time after my mother died, I visited her grave site. So I had entered and exited the car a couple of times. When I got out of the car at home, there was a dime lying on the driver's seat. I have other such stories which might be a series of coincidences or not. I just know that I have a cup half full of found dimes.
The last time I bothered to pick up coins was 2000. I was riding a bike to work and I picked up coins just for something to do. Once I found a dollar bill on the sidewalk, and once I found a gold chain in the street. Gold was really cheap in those days, so hippie chicks would wear chains. I kept it for a few years until the price went up and then sold it to a refiner for a hundred and fifty bux.