The house elves would move the suitcases. Hagris would not tell anyone he is a half giant, there was a mini arc about that being found out (some pages).
The hat doesn't talk for all to hear, just to the person sitting there.
This MC personality is starting to annoy me he can't act any less than Gary Stu, should have put in the description that it would be a fanfic with MC Gary stu.
The MC can grant himself knowledge no?
And with his intelligence that we have seen, then he should have definetly have thought about it or atleast knows he can...