For all that haven't gotten around to looking for those golden chests, user Mercenary09 has taken it upon himself to not only find them but capture video explaining where and how to get them. As mentioned in the video, finding all of these chests will score a nice purple Sparrow with 90 durability vice the 70 durability of the stock Sparrow that you get from the story mission. EDIT: Updated to include all of the chests from all planets.