Try to get proof that the shares were sent to unclaimed funds and then contact the Comptroller's Office.
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It may be in the process of being escheated but not yet considered as such. You likely want to get an attorney in Boston (where ComputerShare is) and file a turnover action before the stock actually escheats.
The foregoing is not legal advice nor is it in any manner whatsoever meant to create or impute an attorney/client relationship.Ask a similar question