Art is probably the highest expression of creativity and inspiration of the evolution of man kind. The patrimonial and cultural history of the universe is always translated into a monetary value.  
This value is so elevated that it becomes attempting for somebody to obtain it or damage it illegally. The privation of art may occur in private collections as well as in museums.
Criminals do not have civic sense and certainly often disregard the inheritance of human culture.
Lack of culture, absence of civic responsibility or just pure vandalism lead to substantial losses. We are in a constant battle against crime and criminals. It is our capacity to foresee and create protections which should help to safeguard and recover items that have been illegally subtracted. Insurance should just remain the ultimate parachute for your customer.
Research is one of the most important aspects especially if the policy is called to pay. To prevent disputes about the effective value of the object is our duty. Fair, thorough and correct work has to be supplied not only to Underwriters but also to the insured.