If you CRH enough, you'll find many impaired proofs. Usually the proof is liberated because of a spot or other environmental issue, but some are clean. I received a dime and quarter in change, but probably another 2 dozen impaired proofs from CRH events (mostly nickels). Fun find!!
@ Kevin Mader i was surprised to find this in a box of pennies. but this is the first box iv searched
You'll probably find many more like this. I've found many proofs (mostly cents) in circulation over the years. Crazy how so many make it into circulation.