Stolen iTouch with mobileme set up HELP?

I recently had my iTouch stolen i was able to locate the device (about an hour away from where i live) as soon as i saw it was being used i set up a lock on it. I want to keep tracking it but it will only give me the last location where it was used before i locked it. Is there any way i can remotely unlock it and continue to track it? If i wipe it can i remotely install mobile me again from another device? and what will i need?|||contact the cops or the service, they should help track it down.