Stupid Question about the Vanishing Cabinet

[Constance Vigilance]

No: HPFGUIDX 141699


> houyhnhnm:
> 
> Ch. 8 in CoS. It is the same time that Harry discovered Filch's
> Kwikspell course after being dragged into Filch's office for tracking mud.
> ----------------------------------------------------------------------
> Filch was looking triumphant.
> "That vanishing cabinet was extremely valuable," he was saying
> gleefully to Mrs. Norris. "We'll have Peeves out this time, my sweet--"
> [...]
> Nearly Headless Nick came gliding out of a classroom. Behind him,
> Harry could see the wreckage of a large black and gold cabinet that
> appeared to have been dropped from a great height.
> "I persuaded Peeves to drop it right over Filch's office," said Nick
> eagerly. "Thought it might distract him--" 
> ----------------------------------------------------------------------
>


CV, confused:

If the vanishing cabinet was turned into wreckage in CoS, how could Fredngeorge have pushed Montegue into it three books later? 

Also, is Filch's office in the basement? Otherwise, how could a Vanishing Cabinet on the First Floor be dropped over Filch's office?:-s



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