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barrysloateBe honest with him, be informative, show him that you have an expertise with his material. Tell him the various options for disposing of his collection, and help him make a decision. Cherrypicking is great for you but it might not be in his best interests. 600,000 vintage cards seems almost impossible. I didn't think there were even that many in the hobby. Good luck with it. It's so large that you may have to go with a big auction house and take a finder's fee.