I think BladeRunner knows better than that!
The copper will oxidize if left exposed to ambient air. I don't believe that AS would have a detrimental effect on the copper, in fact, I would use it as soon as possible, after lapping. Once polished, and cleaned, I'd heat up the surface with a hair dryer, or something, to make sure that the cleaning fluids evaporate completely.
The rest of the bottom will oxidize, but who cares?
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