If you’re a Missouri resident (or work in/do business in Missouri), you may want to search the following website-- the State of Missouri may owe you some money. It probably doesn’t owe you very much money, however, so don’t get your hopes up too high:
Yes, MO owes me money, too-- but I'm not packing for Disney World, either...
By the way, site URL tells us the site above is actually a MO state government site and not some scam site.
I originally found the above info about myself searching a site called Pipl:
You may also want to search Pipl for yourself and a few friends/relatives. Some results are not relevant, of course, and some are sponsored (pay) results, but some are relevant and many are free. Interestingly, each of the searches I did included some results very likely to interest genealogists.