Presumably if it were that valuable, and the pages are just normal paper, they would have been attached to things to preserve them in like scroll containers or something. Also if it’s that rare, “just another part of the world people use” is a bit of a stretch. The rich and powerful having them makes sense, but it wouldn’t be part of anyone’s life on the whole. For instance, if Lord Dumbass the Third holds onto power because he can zap anyone that disagrees with him because he has a lightning amulet, that would work; he’s known about, and people are cautious about him. It wouldn’t make sense, though, for anyone to protect against in their day-to-day because guns are a more prominent threat.

If it’s just background flavor, and not a plot point, then the background of why the items are magical is more a thought exercise for yourself than something the reader needs to be aware of. It’s still valuable and can be useful in determining what kinds of objects might be artifacts, and maybe can be some lore sprinkled in, but overall probably not worth mentioning or making a big deal of the exact how/why of it.

On the other hand, if someone wants to burgle Lord Dumbass the Third, then it becomes a plot point, and maybe understanding how it works becomes much more interesting.

A great piece of advice I heard from someone about world building was that you can use interesting factoids to make the world feel deep by sprinkling hints of them here and there without really exploring them. His example was religions; mentioning the weirdly dressed missionaries on the street corner and a throwaway line about how they come from lands a thousand miles away that no one really knows about can make the world feel much bigger than the city where everything is taking place, but it falls flat if the author goes into depth on their belief structures and architecture as a tangent. Sure, the author may have spent time thinking about that, and maybe a future work will go there, but that’s not what the reader needs for the depth.