Thank you! I hope it went well!
Once players find all 3 clues for a component, the GM is supposed to tell them outright what its class is.
"Each component of the anomaly has 1-3 clues, which, once found, will reveal the component, and its containment class— which you will learn more about in the Containing section."
It is, admittedly, poorly written and not very well explained in that sentence. Sorry on that! The way that works is very much something I'd like to improve for the 2nd edition, whenever I get to designing it.