Am assumimg that he may have been told [before he sent it to them] that The Chagall Society may want to have it destroyed if they considered it a fake? Maybe not though.The tests done before that with the paint seemed to prove it a fake anyway, but as you all say, it's his property; But if you buy a car which is stolen [fake] you have to give that up with no compensation, and the Chagall Society are saying [in effect] that the name of the artist has been stolen in this case.The painting is dreadful, how can he want it [not only of no value but of no artistic value either!]Hard to feel sorry for him , he has pots of money and took a chance on buying it just as a speculative enterprise.