They will not just ask you for the logfiles. YOU will have to find out which
ip-address was routed on your server on a more-or-less specific timewindow
in the last 6 month and with which ip-address the data was forwarded to the
next router.
If you can not provide this information you will be charged by law. In my
opinion, as an tor-operator you will not be punished for the maximum years
of inprisonment or the highest money fee possible ... but it could be hard
enough if you have a previous conviction in your police file stating you to
be "involved in computer crime and a possible terrorist" :-(