This works for anyone who's ever lived in the US. For example, if you're a Canadian who went to school in Delaware and never got your US tax refund, The State of Delaware still has your money!
(Edit - It looks like people are finding money! Please feel free to copy-paste/repost or link this information around! Anything that helps spread the word is okay! :D )
#1 UNCLAIMED PROPERTY
Unclaimed property often isn't actual physical property. Missing Money "is a database of governmental unclaimed property records. The government safeguards your money and returns your lost funds. Common types of unclaimed property include:
Bank accounts and safe deposit box contents
Stocks, mutual funds, bonds, and dividends
Uncashed checks and wages
Insurance policies, CD's, trust funds
Utility deposits, escrow accounts"
You can check for unclaimed property here: http://www.missingmoney.com/
Some of the states don't participate in missingmoney.com, but you can search that state's name and "unclaimed property" to find their unclaimed property website.
Some of the big states that aren't on Missing Money:
California Unclaimed Property
Illinois Unclaimed Property
Connecticut Unclaimed Property
Georgia Unclaimed Property
Hawai'i Unclaimed Property
New York Unclaimed Property
Tips: Sometimes these unclaimed amounts can be decades old. If you'd like to search, remember to try old versions of your name (if you've ever changed it) or states that you haven't lived in for years.
#2 UNCLAIMED PENSIONS
The second site is the Pension Benefit Guaranty Corporation (PBGC). PBGC is a federal agency that protects pension benefits. Even if your corporation went bankrupt, or your pension simply went unclaimed, there's a good chance that PBGC will still pay you.
Given how hard the last few years have been, it could really help people out if it turns out there's a pension out there they can claim.
#3 Other Resources for Unclaimed Property
Other Resources from National Association of Unclaimed Property Administrators, including France, Canada, Australia, New Zealand, and Switzerland.
Happy hunting! :)