Here's one from an Orlando site:
http://www.clickorlando.com/news/28038754/detail.html
ORLANDO, Fla. -- The Internal Revenue Service issued a lien against Casey Anthony over nearly $70,000 in unpaid taxes in the 2008 tax period, according to a notice filed with the Osceola Clerk of Courts.
(snipped)
The notice of federal tax lien indicates that Anthony owes $68,520.41 in unpaid taxes.
According to the notice, it was filed on May 17
(PDF of IRS Lien attached [from the article] .... more at the link)
ETA: I just noticed on the lien that it shows Casey Marie Anthony and her residence as 522 Simpson Road in Kissimmee (Baez Law Firm). So, I'm assuming the check(s) went straight to his office.