Unknown copper plate - too soft for making a case?

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I came across some nice looking copper plate at the scrap yard. There's no way of knowing what alloy it is. It's about 3/8" by 18" by 18" and available at spot copper prices. I was considering this for a Class A amp case.

Is copper too soft? Will I get all sorts of dents and scratches in the case if I get the wrong alloy?
 
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