From the recent trove of preserved video from Noclip Game History Archive, here’s a look through Nintendo Of America’s internal employee-only museum/store, circa 2006, on Youtube. There is very little sound in the footage, so you might want to increase the playback speed to double.
For context, it was near the end of the Gamecube’s life, immediately before the release of the Wii, and the early years of the Nintendo DS. Objects glimpsed during the stroll include various consoles, records of Nintendo’s collaboration with the Starlight Children’s Foundation, Pokemon merchandise, Nintendo awards, some arcade units (including a glitched Mario Bros. cabinet), a Virtual Boy, various character statuettes, old playing cards, a capsule timeline of Nintendo history, and various games for sale at the time. It seems that the museum also functions as a retail space for employees.
Exploring Nintendo of America’s Employee-Only Museum (Youtube, 28 minutes)