Help gas thing stuck

Yeah I have a lawnmower riding and I was filling it up with gas and I guess I accidently let a cap fall in from the gas can.

It is a yellow gas cap and it is from a red type bottle. I have tried everything, putting it on a hill, taking it out with a hanger no luck I cant see through it!

I dont know where inside the gas tank it is located or if it has sunk, I need help my dad is coming home and he'd be piseed



Also how will it damage my tractor