The IRS owes Hawaii residents hundreds of thousands of dollars.
The IRS is looking for taxpayers who had their refund checks returned, mostly due to mailing address errors.
About 693 residents are owed refunds totaling more than $680,000.
If you think you're missing money, visit these websites for information on how to collect:
https://sa1.www4.irs.gov/irfof/lang/en/irfofgetstatus.jsp
http://www.irs.gov/individuals/article/0,,id=96596,00.html?portlet=4
