Check the Florida statutes for unclaimed property.
The link at the end of this note will take you to one of the sections that define the time limits. Chapter 717.112 (2) seems to deal with IRAs:
1) All intangible property and any income or increment thereon held in a fiduciary capacity for the benefit of another person is presumed unclaimed unless the owner has within 5 years after it has become payable or distributable increased or decreased the principal, accepted payment of principal or income, communicated concerning the property, or otherwise indicated an interest as evidenced by a memorandum or other record on file with the fiduciary.
(2) Funds in an individual retirement account or a retirement plan for self-employed individuals or similar account or plan established pursuant to the Internal Revenue laws of the United States are not payable or distributable within the meaning of subsection (1) unless, under the terms of the account or plan, distribution of all or part of the funds would then be mandatory.
http://www.flsenate.gov/Laws/Statutes/2011/717.112