Korean and Chinese cards, while growing in popularity, tend to be less valuable compared to their Japanese and English counterparts, partly due to print run sizes and market demand
What relationship Number Archive has to the airship, or if it even is the airship itself or a portion thereof, is unclear
Compared to the other three, her specs are slightly inferior, and in fact, it's not uncommon for her to be reduced to two copies in standard builds, but just being an Exosister monster makes her worth more than enough, so personally, I consider her a mandatory three-of
Each inner box can hold more than 80 cards with Deck Sleeves (or more than 160 cards without sleeves), for a total of more than 160 cards (or more than 320 cards without sleeves).
Keep in mind I usually do not make control decks, so there won't be a lot of counterspells and the like here