Yes.
Sometimes it is difficult given relevant parties.
But it would be less difficult if there was general recognition among the auction houses - and buyers - that 'important' pieces ought to be accompanied by provenance, in a manner similar to art. for all 'important' items, say values of 20k+? I do not know how others would define 'important' items. Or whether other opinion would be for all items, or items with values of $1500+, and distinctions in value between cards and memorabilia, say cards with values of 50k+?
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