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MattRed - the seller would certainly have denied any package from me with signature confirmation knowing it would be all the proof I needed to get the money away from him. Delivery Confirmation was the only method which was proof of delivery that didn't require acceptance from the seller.
The seller of the 5 cards has nothign to do with the 2nd case, it was just a jerky seller who wants me to prove I didn't switch cards and thinks SGC doesn't know what they're doing.
I contacted the collectibles insurance company to see what they would have done for me here.
Thanks to all for the suggestions.