I was once subpoenaed by the state of New York. It was worded similarly, asking for a bunch of information and my personal appearance. I have never lived or worked in New York, and at the time was just a broke college student, so taking time off school to fly there would be more than an inconvenience. The information they sought was related to a fraud case, and their fraudster had bought something from one of my websites in the past. After I actually talked to the investigators over email, they never actually expected me to travel to New York, they were just looking for dates and IP addresses relating to these sales, which I emailed and my participation in their investigation was over. They didn't actually want me to go to New York, that was just boilerplate.