Maybe the delivery company would store the information about the verification in a database that only the sender could initially access (but also including an I

Maybe the delivery company would store the information about the verification in a database that only the sender could initially access (but also including an ID that the recipient could verify after the sender provided the appropriate URL). So shipping company staff other than the one who performed the verification wouldn't easily be able to learn about its results. (Maybe this, in turn, would create some other bad incentive or opportunity for fraud.) Another random idea: law enforcement agencies could conduct sting operations where they buy and sell valuable items online (with extremely thorough documentation of the shipments sent or received), and then criminally prosecute counterparties who commit outright frauds. E.g. maybe 0.05% of the people buying or selling expensive cameras would be police and prosecutors who would try hard to send you to prison if you tried one of these scams against them.