I wrote a paper that may help with this. It was about how the Ptolemy's were able to maintain control over their Egyptian subjects, and the system of courts had a section in there. In Ptolemaic Egypt at least, there was a court system in place.
One case in particular was mentioned about a dispute over the ownership of a house in Thebes. I'll see if I can upload the paper to rapidshare. If you have access to Jstore I'm sure it has a wealth of articles on the subject.
Also, Bagnall and Derow's
Historical Sources in translation - the Hellenistic Period is a great source for this. Many of the papyri that have been recovered have been about some poor schmuck writing to a government official asking for justice. You can probably look through it online through google books or Amazon.
Here it is:
http://rapidshare.com/files/44583354...Convention.doc
The relevant section starts on page ten.
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