(A quick note/disclaimer: I am extremely happy in my current situation, and work for a great manager; no interest in moving, despite my flippant comment.)

The signal was what I was told when I got a subsequent unsolicited contact from a Google recruiter. She communicated this information to me verbally. (I believed her, and in retrospect still do. She was great during the whole process; never gave me the slightest indication that she was in any way deceptive or dishonest.)