>>724528416 (OP)
It was left as a mystery that was discovered by the community. Most of the items weren't revealed in game. Reminder that Devil Bottles was a pretty much entirely complete game mode that was uncovered by the community. Then the SNS remnants in DK64. Very cool and intriguing. It was the age of playground rumors like L is Real. At the time, most of those community members were pretty young. It felt like any sort of wild secrets could be discovered in games. Anything was possible, or at least it felt that way.
Then throw in the fact that this was in an era where these kids could gather in tight-knit communities like Rare With Project or Spiral Mountain because Reddit hadn't murdered internet forums yet. They'd come up with wild theories and make hoax videos to stir up each others' imaginations. There's no mystery in games like that today that's even comparable, and there are no real communities for young gamers because of Reddit and Discord. Everything gets datamined instantly today on top of that. It was a pretty magical time to be a kid who liked video games.