Very interesting and entertaining post. It's interesting that many of us share some elusive coins in common. I have been a detectorist for 25 years and have never found the following coins:

Trime
Shield Nickel
Three Cent Nickel
Classic Head Large Cent (thought I had one recently but my eyes deceived me)
Liberty Cap Large Cent (watched Dan dig one)
Flowing Hair anything
Nova Constellatio
Vermont State Copper
Zero Gold Coins

Finally crossed a Capped Bust Dime off the list a few weeks ago that was five minutes from my house.
And, everyone knows that I dug up a Pine Tree Shilling a few years ago thanks to Dan and his nose for cellar holes.