There is a bit of space under the tank but on top of the square center tube of the frame. If you can get one of those extendable magnets on a stick in there, you might pick it up. Of course, you might also stick to the frame, the tank, etc. If you don't find it there, check between the jugs. It is possible for something to ride down the frame rail and fall in between the jugs. There's actually quite bit of room in there. Good luck.
'07 VN900 Classic
Horsepower is an illusion.
Torque is the source of all good things.