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The RPO codes will be on a decal located either under the console lid or the glovebox door. Write them down and post them here where members can tell you what the codes mean. You might even take the VIN to a Chevy dealer and ask them to run a Vehicle Service History Report. The detailed version should show the RPO codes for everything that was installed on the car. It will also show what work was done at a Chevy dealer.
The other (and best) option would be to order both the Build Sheet and the Window Sticker from the National Corvette Museum. The build sheet follows the car along the assembly line and it contains codes for all of the components. The Window Sticker will have a list of the standard equipment and all of the optional items. The base price is shown along with the cost of the options. The sticker will also have the name and location of the dealership where the car was sent. The two documents are pretty pricey so once you buy the car (or any other C5) then you can order them.