Site is legit. It only supplies you with info to search and claim on your own. Find your state (or states) here.
https://www.missingmoney.com/General...eAddresses.cfm Click on the State names.
I have got money back from Colorado & California. You can claim under any name etc that you can prove is yours.
( A bit of fun, lookup names of friends and relatives, amazing to me what some of them are leaving "on the table")