I've been looking for either a CUD or a missing clad error... for two years... and nothing... i can't say that they are impossible to find... but they are damn close!!! I go through about 100 bucks a week
Don't kid yourself. Missing clad layers are rarer than cuds, but even cuds are hard to come by. They watch the dies pretty closely and they are replaced very shortly after they start developing cracks, so full cuds seldom developt/
Hey I look through all my change and it took me 14 years to find a radar note on my own. Then I found a second one 2 years later, so they're not impossible.
i have 3 $1 radar and one $100 radar note, all found in circulation... several repeaters. But then again I go through EVERY single I'm handed at work... Hell... i'm thinking of working at a bank now *L*