The Internal Revenue Service is looking for 314 Delaware taxpayers who have not received refund checks worth a combined $377,000.

These undelivered refund checks were returned to the IRS by the U.S. Postal Service due to mailing address errors. The IRS can reissue the checks, which average $1,200, after taxpayers correct or update their addresses with the IRS.

Nationally, there are 107,831 taxpayers with undelivered refunds, totaling about $123.5 million with an average refund of $1,148.

“Taxpayers should not miss out on getting their money back,” said Delaware’s IRS spokesperson Gregg Semanick. “The IRS makes it easy for taxpayers to update their addresses and claim their refunds.”

All a taxpayer has to do is update his or her address once. The IRS will then send out all checks due.

Taxpayers can update their addresses with the “Where’s My Refund?” tool on IRS.gov.

Taxpayers checking on a refund over the phone will be given instructions on how to update their addresses. Taxpayers can access a telephone version of “Where’s My Refund?” by calling 1-800-829-1954.

The IRS encourages taxpayers to choose direct deposit when they file their returns because it puts an end to lost, stolen or undelivered checks.