<prompt> Human: Dad is getting ready to retire. Found a Certificate from my grandmothers old stock broker made out to me from Dec 1983 for 100 shares of ATT. Is it worth looking into and finding out what these shares have been doing for the last 30 years? do i still have a valid claim on them? If they are still good How do I know what they should be worth, would the dividends be reinvested? what about divestituresUpdate: Tried to call the number they are only open M-F will call on monday..  <response>: Definitely look into that. Sorry i have no clue how to go about doing that. 