For expensive things people usually ask for chain of custody type of thing.
I know if i was looking at two 1914 Cracker Jacks PSA 7 for $4000 and one guy can show 7 past sales of the same card for the past 10 years and the other guy cant show me any past sales, i would value the one with history more.
If its an original owner or came from the original owner of the card that bought it as a kid etc, i would require more than their word.
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