Contact the Sheriff's Office property section. Give them your name and agency case number (which will be on the initial police report). Since you are not picking up the evidence, the Sheriff will want a release form/power of attorney. Ask if they have a form they can send you (most Sheriffs do). Fill it out, get the original to the Sheriff and a copy to your friend along with a copy of the Judgment.
That should do it.
You don't need a lawyer.
Please note that my response to your inquiry does not establish a lawyer-client relationship. Nothing contained in this response should be considered by you to be "legal advice." If you are interested in retaining my services, please visit www.waylawfirm.com for my contact information.
You can do it on your own by following my colleagues advice. If you get nowhere, you can hire an attorney to get a cour order or a writ of replevin issued.
The information provided is not legal advice from Criminal Defense Lawyer Albert Quirantes, or the Ticket Law Center in Miami, Florida. There is no attorney client privilege created in this communication. Do not send questions which are confidential in nature by either this venue or via email. Personal questions should be asked in person or via telephonic conference only. You should only ask theoretical questions of a general nature.