You got the non goldens as the 10th anniversary event gift upon logging in and seeing the event popup for its first time. These normal, non goldens, are for all. The Golden copies are for completing the event track. The reason to complete the track on purpose is to obtain golden copies to use for an all golden cards deck is my understanding. Otherwise it would be for the coin at the end of the track. Unsure if we got a plain copy of the coin along with the others.