2000 south carolina no copper clad showing. plated?

i did a post yesterday about a proof question. i have posted this coin before and someone said it was plated. so with that said, do proof coins have the copper clad showing? or do they not have one? so my question is, if proofs don't have the copper showing could it be a proof coin that was stolen from a collection and spent?

 

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Is it an S mintmark? If not, its not a proof.

 

If it has any mint mark other than "S", it is not a proof coin.

In my opinion, your coin is STILL plated.

 

if it has an s could be a silver proof