I would assume so also. I just do not know and I haven't ever heard a player run shard admin actully get into it but I've heard the question time and time again. It's kind of like if I kicked the crap out of my neighbor and some items came up missing in my house, would I call a cop? Probably not.
However, attacks on anyone using a computer I thought was illegal regardless also. We used to bomb the kiddie sites in IRC long tme ago but a law got passed under Bubba that enforced cyber treats and we were k-lined from then on, regardless of whether or not they were doing illegal activities. So I guess you're right, it really wouldnt matter. Unfortunately, someone obviously this capable has learned to cover their tracks.
This is a growing problem all over the net and I have to wonder if the people that do it think about what it will mean for their own privacy in the end when measures are put in place to end it, because it will take away personal internet freedom. Sometimes I wonder about that.