The coin you were searching for was the humble 1 cent piece
And there were quite a few recovered! Here is my count - let me know if you think it's out:
Not surprisingly the winner is the North Island.
But all of you impressed me with your diggings, especially with the crazy weather we had.
Now you have a single vote to decided the second category winner.
Best Find Survey:
(please don't vote for yourself - your vote can be seen)