Valuable art can be hidden for decades . `` Russian Schoolroom '' remains in Spielberg 's possession while courts determine the rightful owner , a spokesman for the director said . Soft targets like museums entice thieves , experts say . Norman was found in Steven Rosen 's collection decades after theft . Nothing glamorous about art thieves , he said .
Valuable art can be hidden for decades . Soft targets like museums entice thieves , experts say . Norman was found in Steven Rosen 's collection decades after theft . Nothing glamorous about art thieves , he said .