This Instagram user managed to obtain all the 4 trading cards from the Yamino ni Mau Aoi Tori CD only copies he bought
https://www.instagram.com/p/B1_YUS0JhPV/
It's very rare to obtain all 4 trading cards at the same time cos normally fans tend to buy multiple copies in order to get the full set
But looks like this doesn't apply to this Instagram user who has unusually really good luck