The Internal Revenue Service is looking for 11,278 Florida taxpayers to whom it owes a combined $19.7 million in refund checks, reports the St. Petersburg Times.

The checks, which were returned to the IRS because of mailing address errors, are each for an average of $1,747, said IRS spokesperson Mike Dobzinski.

Across the country, 111,893 checks — adding up to $164.6 million — were undeliverable.

Those who believe they are owed money can check the status of their refunds on the IRS website under the “Where’s My Refund?” link. Taxpayers can update their mailing addresses, if they are eligible, and have the check reissued.