Are you 100% sure your broker doesn't know what company they are? Or maybe they just aren't listing the name anymore in your portfolio. Try calling them and asking them. In Etrade, if you put your mouse over the number, the name comes up. Not sure how TD does it - haven't used them in many years. If that doesn't work you can copy and paste the number into google search and write "Cusip" right after the number and it should bring up references to the company that it is associated with.
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