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Something is only worth as much as someone is willing to pay.

Seeing as how it's a felony to buy it, nobody is going to offer anything for it publicly.

There might be a way to make money from the painting without selling it. For example, are they allowed to rent it out to a museum?

Then the money earned leasing it out would be taxable, but you still can't sell it so there's still an issue with taxing its value