How did DD know that Fake!Moody was Barty Jr.? (Was: Hogwarts House-elves

[pforparvati]

No: HPFGUIDX 161876

> > PforParvati:
<snip>
> > How did Dumbledore know in advance that Winky would be needed
there?
<snip>

> Pippin:
> Sirius is probably the missing link here. He knew that Harry had
seen
> Bartemius Crouch on the Map, burgling Snape's office. We also know
> that Sirius was in contact with Dumbledore (quoting from memory,
> "You are not Sirius's only correspondent.")
>
> Pippin

PforParvati now:
  I agree with you that Sirius must have told Dumbledore about Harry
had seen Barty Crouch on the Map, burgling Snape's office. But it
looks funny that Dumbledore knows about this incident still he
doesn't know about the map.

Here are the quotes from the interrogation of Crouch Jr.

"....I used the map I had taken from Harry Potter.  The map that had
almost ruined everything."
"Map?"  said Dumbledore quickly.  "What map is this?"

It looks like Dumbledore doesn't know about the map. He should have
known at least the existence of such map. Sirius must have told him
that. [ or did Lupin handed it back to Harry without telling
Dumbledore  about it in PoA..?]

Ok..I am combining two separate incidences here. But Dumbledore's
question `What map is this' is really confusing or rather the
word `quickly' is making it more confusing. If Dumbledore was aware
of the map, would he had asked the question that quickly
or is he
pretending he doesn't know about it in front of Snape and McGonagall
since it was out of discipline to allow such map.

PforParvati, becoming confused more and more