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MattMark - I don't disagree with your assertion that someone who runs a card shop might know better, but as far as needing to meet the requirement of the insurance company, since there is no such certification, it's arbitrary that they would require "someone who works in a card shop." Who says that card shop even sells vintage cards?
I'm assuming you have a good idea of what they're worth and you're just asking how to fulfill the insurance companies requirement. If you wanted a real appraisal for yourself, that's a different story.