Looks like a Ps Vita card
Source: https://arstechnica.com/gaming/2017/02/nintendo-switch-retail-boxes-are-an-ocean-of-wasted-space/
(=^・ω・^=) Kuroneko S2 - Ore no Imouto - Steam, MyAnimeList and Twitter - PSN: Gustavo_Valim - Switch FC: 6390-8693-0129 (=^・ω・^=)