I'm voting for the whole..There simply isn't enough info. If things are actively being hidden over time by a powerful entity.. THey've had lot of practice and time to cover their tracks... They really won't miss a whole lot.
While 32 Sounds like a lot.. and it is a pretty nice roll, it isn't amazing world ending awesome.
In this context. With how little to no info they have at all, I wouldn't give anything except on a 20. Which would net them a spark of inspiration . a Thread to pull. like a small detail in a book they read as a kid that had an item with a similiar appearence. Written by X name. Which through much research and a treck to the library or divination spell you learn was written via a pseudonym of one of few people who have known about it. Having written to off handedly start to hide breadcrumbs.
So they they get to hunt down more works by the fake names and piece together the whole legend and history through that means.
I cited a 20 cause that is just my own marker for "super duper inspiration moments of clarity" but that roll would be easier once they learn more about said item and such. Which given that seems to be a big point of the game, means they'll gain more glimpses and scraps. It is a shame they know about it metagame wise. Otherwise I would award circumstancial DC lowering for their own clever thinking. I suppose if someone else tried they could do it..
Alternatively they could retry the roll in a library and stumble across the crumb in a kids book that leads them down the rabbit hole.
Basically. It is entirely reasonable to haven ever heard or remotely knew of such a well hidden item (hell who is to say no one ever wished for its secrecy? You could even have them run into someone who knows of it.. and once they gain the knowledge that fellow vanishes out of existance due to some past wish. Which would cause a sense of urgency because the group has been roped into something dangerous. (obviously dont delete them from existance, but you could have arunning...
Ehm... The player rolled more than the 20 you mention, he rolled a 32.