You don't. Tax man cares not how you bought it, only that tax is fully paid when sold.
Is not it cheaper to pull this trick with higher number of no-name artists paintings by moving the money betweent two ofshore companies that belong to you. Therefore I believe this purchasecwas was a status purchase like yachts. It is a show off that a person has so much resources that can spend part of it on a peace of art that nobody can get.
if that was the case you might just keep the initial money and not launder them...