The Map (Blocked Passage)

[Chelle]

No: HPFGUIDX 98183

It's always bothered me that Harry's never investigated the blocked
passage Fred mentions:

'There are seven in all. Now, Filch knows about these four-' he
pointed them out,'-but we're sure we're teh only ones who know about
these. Don't bother with teh one behind the mirror on the fourth
floor. We used it until last winter, but it's caved in - completely
blocked.'
UK Paperback Pg. 144

Not even a peek behind the mirror. Where is it caved? At the mirror or
half a mile in? Hmph. 

Poo on Harry for never being curious about important things concerning
mirrors. I see a pattern here and I don't like it.

~ Chelle
And concerning the twins: they still had 2 years left at the school,
wouldn't they want the map? Why did they use the other passage rather
than the one to the Candy Store? Where did it end?