Considering buying this C6 - are these "blemishes" normal?

I'm considering a base 2006 C6, 3LT, manual, 13k miles (non Z51). The only major part that isn't stock is the exhaust (+ new tires).
Are the "blemishes" just under the air intake in the first photo, on the undercarriage, and on the wheels in the last photo normal? Is this due to salt on the road? I'm not seeing any rust, just these spots and wondering if others can chime in on informing me what this is.

Also to the people here with a bit more Corvette experience than I, how much would you offer for this car? Assuming no faults, everything is in pretty mint condition (as long as the "blemishes" in the photos are normal wear&tear..)
I'm thinking somewhere around $27,000. Does this seem reasonable?
Thank you.

https://preview.redd.it/u4684b1qpf0d1.jpg?width=918&format=pjpg&auto=webp&s=0e53313ffe192277cb00a5d84f16d3c02e0cac97

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https://preview.redd.it/1d5awb5spf0d1.jpg?width=1730&format=pjpg&auto=webp&s=b3f119520a91295e24d608d8baf1ddab32dfa343

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https://preview.redd.it/hazxdvptpf0d1.jpg?width=603&format=pjpg&auto=webp&s=97a0503d056223abbbde1eee403e57507d63cf91