"Bought IPO long ago, company never going public" is a complete contradiction. Either the company did an initial public offering and you bought shares or you somehow got shares in a privately held company.
I have hundreds of thousands of shares in various companies I used to work for that are now valueless. They're common shares that were washed out when the company merged into another company where the preferred shareholders were the only ones who got money out.
I do have some shares in Alcatel-Lucent that I need to chase down at some point. They're pretty much worthless so it's hardly worth the bother.