This letter request an update or other pertinent information regarding a case that you're involved in.
1234, Main Street
Boston, MA 02123
06 April, 2005
<Recipient Address Goes Here>
Re: <insert case name>
It has been some time since I have heard from your office. I would appreciate being provided with a brief update on the status of my case. Thank you for your continuing assistance in this matter. I look forward to hearing from you.
encl: <List of enclosed items goes here>