Originally Posted by 96tbird
Those wires are to connect the metallic shielding paint to ground.
Yep. That's how shielding is done when the bass is shielded at the factory. Perhaps you're more used to seeing a tiny piece of copper tape with conductive adhesive, instead of the spade lug, or copper tape only, instead of conductive paint.
Jacks and pot chassis are rarely grounded with soldered connections, since mounting to a control plate or shielded pickguard or rear-route cavity accomplishes the same thing. There are mixed opinions on the inferiority of mechanical grounds. Some feel it doesn't matter; others feel a proper solder joint is key to a dependable wiring job.