Key points in CoS

[conquistas2000]

No: HPFGUIDX 46590

I always wondered about the Masons from the CoS, and if there's
something more to them.  For all the secrecy of the wizard world, they
(MoM) are awfully careless about hiding it from the Masons (Muggles?
or not?) with the owl post (Underage Magic notice).

I think the Masons probably know about the wizarding world, or will be
(muggle-born progeny).  Thus, MoM didn't bother to be more careful
about how and timing of the  owl post.

Conquistas - Who's re-reading CoS