Why are these properties unclaimed?

Each state and many federal agencies have enacted unclaimed property statutes that strictly prohibit companies from keeping funds that they can’t deliver to their rightful owner. These laws require companies to turn undeliverable funds over to a state agency that holds these funds in trust. The state agencies will then make a diligent effort to find the rightful owners. Most states hold lost funds until the owner is found, returning them at no cost or for a nominal handling fee upon filing a claim form and verification of your identity.