Many games used time-limited DLC (e.g., StreetPass Mii Plaza premium games, Pokémon Mega Stone distributions). Without an archive, these are permanently lost.
As Emily explored the library, she discovered DLC packs for games she had long forgotten, such as additional characters for Mario Kart 7, extra levels for The Legend of Zelda: Ocarina of Time 3D, and even a special demo for the critically acclaimed Phoenix Wright: Ace Attorney series. 3ds dlc archive