Now, with those efforts swelling state coffers by more than $40 billion and lawmakers using some of it to patch budget holes, skirmishes are breaking out between states and companies with their own interest in holding on to the unclaimed property.
Companies accuse states of overreaching. State officials counter the businesses are more concerned with keeping the assets themselves. But critics say rightful owners too often get short shrift.
"The analogy is to finding somebody's lost wallet. In Minnesota, anyway, we give people their wallets back. It's just what we do here. But it's not what the state is doing," said Joe Atkins, a state representative from outside St. Paul who last year introduced a bill calling for increased funding to track down property owners.