Here's the ball. I've looked at other team signed footballs from 82 and surrounding years and they're all signature faded and cracked. These sigs look fresh. Were Sharpies even used much back then..? This seller also has some questionable feedback...

But a Packers team signed ball from the same year sold at Heritage Auctions in 2006. The sigs also look fresh but there was an LOA included with it. They don't appear to be the same ball because the signatures are in different spots etc.

I suppose this ball could've been completed years after 1982 but I can't really verify who is living or dead so maybe not... Were teams releasing facsimile signed balls that year or in the years after through a back catalog? Doesn't seem likely they'd change the signature placement and style if so. Could also be forged but that seems like a lot of trouble to go through...unless you're a scumbag.