You need to understand that they aren't intentionally leaving out that information. It's just that a lot of the time, the chapter was only mentioned in a blurb, and that information wasn't relevant to the blurb.
The Angels of Fury, in C:SM53, literally appear only as a black and white logo and name on a star map (signifying their homeworld), and in a one sentence blurb about routing some Word Bearers. And again one throwaway line in
IA:9 about the Novamarines being selected as a training cadre for the chapter.
The Lexicanum just diligently records every known mention of a Space Marine Chapter. And the only info they have on some of them is the name.
The blurb where the Star Leopards appear literally only says they had a Land Raider get stolen by some Eldar and fought them to get it back. It would read pretty silly if it said "A hundred Star Leopards, of the 15th Founding, and Ultramarines geneseed, from the planet Hoosefus IV, broke into a charge, shouting the name of their Chapter Master Bosequius Flambe." So yeah, they're leaving it out "on purpose", but it's not for any deeper reason than that. Not to make it mysterious, or even to annoy you.