A couple of hundred miles away, you can usually keep the location of your GMRS license private. For example, instead of providing your actual address or workplace, you can use a post office box. Did you see the exact location, or was it just the post office box code?
is it just on mygmrs.com/map or on the repeater book?
What makes you think this repeater is linked illegally? Some of those repeaters, if they are positioned very high—like at 1,000 feet—can actually cover that kind of distance. Additionally, if your repeater is on a very tall mountain, it can typically reach far distances as well.