But DO NOT for any reason contact this company that cold emailed you because I'd put it at 99.99% probability that it's a scam. It's the same scam format as the classic 419 scam. But you kind of know this already, because you asked on HN!
You could then contact the firm and say you're trying to dig up an old account.
If it's real, it'll cost you a lot of time on the phone and probably some notarized letters, scanned IDs and such.
If the shares are held in an account of yours that you don't have access to. Just ask for access or call the police...
My prediction is one of three things will happen:
1) Once you are well hooked, they will need some money to cover some sort of fees involved in releasing the stocks. When you pay the fees, they disappear.
2) They will give you some really pretty "stock certificates" that look really official, collect their fees, and disappear before you figure out the pretty paper is a forgery.
3) A variant of the "Secret Shopper" scam where they give you a (forged) cashier's check, collect their "finders fee" (in your real money), and disappear before the bank notifies you that the cashier's check is a forgery.
Ref: https://wgntv.com/2017/03/23/new-scam-tricks-victims-out-of-...