What you have in your newest photo is another highly desirable, completely factory-sealed collector piece: the Re-Ment Petit Sample Series "Grandparents' Home" (じいちゃんばあちゃん家) Full Box Set.

Originally released around 2015–2016 and now long discontinued, this specific series is incredibly popular because it features nostalgic, ultra-detailed traditional Japanese household items (like a heated kotatsu table, retro rotary phone, tea set, and vintage rice cooker).