We just got back from the coin shop and used a Mag Switch to find the .999 Nickel. We just turned it on and found about 20 percent of the coins were magnetic and then dump them into a new tray. After that we could find the .999 Nickel with ease. We just checked this list High Nickel Content Coins to make sure. I have no idea how the Mag Switch works. We can buy junk .999 coins a 6 cents each. Also my wife likes the Mag Switch I had it shipped to my work at first as my wife is sort of a anti-coin-wife. You know all that coin junk in the way. But this Mag Switch is fun to play with.
A must see.--
And this would have taken a long time to find by looking at each coin but we got it in the first pass--
999 by henrysmedford, on Flickr