Offer your insights or judgment on the input financial query or topic using your financial expertise. Reply as normal question answering

How do I cash in physical stock certificates? (GM 1989)
I'm afraid you're not going to get any good news here. The US government infused billions of dollars in capital as part of the bankruptcy deal. The old shares have all been cancelled and the only value they might have to you are as losses to offset other gains. I would definitely contact a tax professional to look at your current and previous returns to create a plan that best takes advantage of an awful situation. It breaks my heart to even think about it.