ground on air box

i removed the airbox a few days ago, to replace it with a pod filter combo, and yesterday, i was tidying the underside. I found a ground lead which connects the loom to the front of the airbox (it fits on the bolt that holds the front of the aibox on the underside), and frame. At least, i tought it connects to the frame. However, it goes through a rubber sleeve, so in no way does it ground the frame. The airbox if plastic, so it cant have been grounding that either ? (or is the air box carbon loaded to avoid ESD from air friction ? )

so what would you recommend i did with that lead ?