Yea, I also always suggest that seller do a video of playing the bass, fully through neck so you can hear buzzes, he can show you if preamp is in order, switches, p.u. selector, etc.
Also a video of showing the true condition of the bass, it's easier on video then on photos. We all have in this day of age some kind of wifi camera on phone, or tablet, or computer, then also you'll see how the seller responds to your questions and what kind of person he really is. Just be careful.