Flowers, Roberts ruled that when a mailed notice of a tax foreclosure is returned unclaimed, a state must take additional reasonable steps to notify the property owner before selling his property, if practicable.

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Many states have laws that deem unused gift cards abandoned property, which if left unclaimed for a certain period, can be taken into the state treasury's general fund, just like an unclaimed or abandoned bank account.

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Go to unclaimed.org and click on your state on the map.

WSJ: Search for Unclaimed Money

Nevada: Unclaimed casino earnings will be split between the state (75%) and the casino (25%).

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The state got the letter back, marked unclaimed, and put the house up at auction.

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If for any reason he cannot locate the customer after reasonable and documented efforts as agreed to in writing with FINRA staff, Prim shall forward any undistributed restitution and interest to the appropriate escheat, unclaimed property, or abandoned property fund for the state in which the customer is last known to have resided.

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The website of the National Association of Unclaimed Property Administrators, or NAUPA, has links to each state's individual database.

WSJ: Search for Unclaimed Money

To see if you have unclaimed property, you'll need to search your name in your state's online database.

WSJ: Search for Unclaimed Money