The DMV procedures are here. I'm guessing you'll need to file under TL-25. You still don't get it outright. You put a lien against the vehicle for the amount owed you (for labor/storage/etc), it goes to auction, then what ever portion of the sale price covers the lien goes to you and the rest to the original owner.
http://casey.hsmv.state.fl.us/Intran...6lcontents.htm