Cleaning memorial cents

I tumble clean my copper memorials and turn them in at a local credit union for green rectangular paper. However, if they are encrypted pennies, you may have to have NSA or FBI "crack the code" on each one to be able to clean them up.;)
 
Encrypted pennies? I must live under a rock because I have no idea what they are. Please enlighten this uninformed old codger.
I'm gonna guess autocorrect fixed a typo for 'encrusted' and made it 'encrypted'

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