speculations on the Boggart

[girl_next_door704]

No: HPFGUIDX 112051

Hi,
   I was reading HP(OotP) for the fifth time, when this question 
came up in my mind.
   
   In PoA, Professor Lupin teaches his students that nobody knows 
what a Boggart looks like in it's true form? When, in the OotP 
Headquarters, Mrs. Weasley asks Mad-Eye Moody to look through the 
ceiling and confirm the presence of a Boggart in the drawer upstairs 
and Moody looks up, what exactly is it that he sees? Does he see 
what he fears most or does he see what a Boggart looks by itself?
After all, he can see through walls, invisibility cloaks, etc.
 
   Also, if somebody is scared of seeing their own fear to such an 
extent as to fear it more than the (what they) fear itself, would 
they see the Boggart in it's true form?
                                                                     
                                       Neha S.