well to be honest am not an expert but often see these in stores here - most keepers can only tell you if it is super red high grade if they know where it came from and the fish has papers.
without historical information (papers) and a trusted source (legal farm), its almost impossible to distinguish between 2nd class red and other classes of arowana. have seen several low grade reds and super reds whilst young and they look the same to me. they have a big difference in price when you ask the shop owner though.