Found 20 shares of Burroughs Corporation (defunct, now UNISYS) Stock Certificates, is there any way to redeem them?

A relative used to work for Burroughs Corporation and has some old stock certificates worth 20 shares. Burroughs merged with Sperry UNIVAC to become UNISYS in 1986, which is still a publicly traded company.

I contacted Computershare, the transfer agent for UNISYS CORPORATION. They said the certificates "are not showing as outstanding in our system. This may be due to a transfer, sale, replacement, exchange or escheatment of the subject shares."

They also offered to "conduct research to try to determine what transpired with the certificate(s), we require a non-refundable research fee of $75.00 per certificate."

I'm not sure 20 shares of a defunct company is worth the expense.

They also note: "Please note that if the shares represented by the certificate(s) were sold, transferred, exchanged or escheated more than six years ago, the records pertaining to what transpired with the certificate(s) may no longer be available" and "we suggest inquiring with the unclaimed property department in the state where the shareholder resided."

I went to https://www.missingmoney.com/ and took a look.

Is there anything else I can do to extract value from these stock certificates? What are they worth?

Thanks!