I totally agree. No one expert knows all the makers that ever exited in history. A dealer could sell thousands of instruments in his or her life time. It is impossible to have the correct names on all the instruments that passed through the shop. For example, experts like Beare's and Warren's might not know about American makers as much as David Bromberg. Additionally, lower price instruments do not get as much care as hight price instruments. Gross negligence and deliberate misrepresentation, however, are what could be considered criminal.