Storage/ organisation question

Hi all! I have the core box, some extra heroes, the red skull and the most wanted expansion. I would like to know what the best way is to organize all the “extra” aspect cards that come with the hero packs and with the expansions. I like to have all the pre-made decks ready for grab and play, but for the extra aspect cards i am thinking about adding them all together in the core box and not keep them in the expansion box…. What are your thoughts? Thnx!