Hi Kevin,
You need to protect yourself first. Given your scenario where a buyer can simply say the box was empty and request a refund, you should not go through with it. You can always find somebody to buy a valuable baseball card, even for a little less. Would you rather have 9K for it and a successful transaction, or get scammed at 10K? It's a no-brainer. Ebay/Paypal's answer is simply unacceptable.
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