Lost Nut Driver In Windscreen Defroster Vent

Hello,

I was recently replacing a stereo in my car and accidently left a Nut driver like the one below on the dash.

I subsequently decided to drive somewhere forgetting it was there and it fell down the windscreen defroster vent.

I can here it moving from side to side as I drive round corners.

Realistically, where would it be residing? what is the easiest way to get to it? and could I get away with using an endoscope with a magnet to retrieve it?

Many thanks, in advance, for any advice received.

Sam