If he can monitor ip addresses to make sure this guy isn't browsing anymore, then he should be able to check those same logs to answer his own question. If you

If he can monitor ip addresses to make sure this guy isn't browsing anymore, then he should be able to check those same logs to answer his own question. If you want people that have zero obligation to help you then you should probably be nice to them. The nefarious criminal isn't going to report things like this to you.