Hypothesizing how this could be done... The simplest method may be to plant a web page that has high ranking for the sources name that phones home details abou

Hypothesizing how this could be done... The simplest method may be to plant a web page that has high ranking for the sources name that phones home details about all requests the the site. If the site normally only receives standard webcrawler traffic any human traffic after such a meeting would serve as a canary of sorts. I mean, presuming that they don't have an inside line with google.