I get them all the time looking for 70 - $400 cameras (they started with the smokes

) and I used to mess with them. For a while I would reply with threatening letters about how I have already tracked their "real isp" and
my agents are devising a tactical plan of entry at this very moment in their neighborhood, and notes like that. Usually it got rid of them.
Just delete and move on (it's easier)
On another note I did see where I won $677,384,204 in the Arabian lottery, just waiting on my check!
Jim