Bubbalarry, We also have CYV and appreciate your dilemma. You can find the name and mailing address for any property from the Sumter County Tax assessor's web site. Just plug in the address. You'll have more info than you ever imagined, including what they paid for their CYV.
http://www.qpublic.net/sumter/search.html
Marion and Lake Counties may have similar web access to their tax records.
George