Run your own background check with the state patrol in Florida. It should be easy to do- just go to their website and download a form to send with a fee, most likely.
If you were under 18, I think the chances of that being found are nil. If you were an adult, you may want to double check the status of your case. I think you could call the clerk of court where the case took place? It is possible to make an agreement with the court to have something taken off your record, but then it doesn't happen, because you had to physically go pick up the papers and bring them to another office or something. Or the court was supposed to mail the order and for some reason it never happened. so I would double check that it went through as expected.
If the record was expunged, as you say, that means it's not supposed to be on your record. You could call the lawyer and ask them to explain the exact consequences of the case. I'd rather do my own snooping so I didn't get any nasty surprises, especially if they were due to someone's error.