so long story short i had an ac vent that was broken, and got a replacement for cheap.. as soon as i unscrewed the screw holding it, the screw fell inside the actual ac pipe thing? or somewhere in there.. what can i do..?

i tried opening the cabin filter location.. no go.

 

tape a small magnet on something flexible (vacumn hose, house electric wire ect.) and thread it into where screw fell till you get it to stick and pull it out...most auto parts stores have magnet on stick cheap but may not be flexible enough