Calling is the best plan, but while they are as diligent as they can be about their past records, it seems like their top priority is current and impending builds. I don't think this is information that is at their fingertips and the answer to the headline question is yes, they do work. They work really, really hard at getting people their new instruments and the courtesy extended to the current owners of older instruments of finding and publishing the records takes a lower precedence. I understand your impatience in your situation, but try to imagine the impatience of someone who is waiting on getting an instrument and not just documentation. Time taken to find and post your information is time taken away from building, which hard to come by as it is. It's a very small company and they don't like to hurry any job, which means that when your instrument was made, they were able to do it without compromising. Whether or not you have the information shouldn't affect the sale.