I too got a call from 509-288-4652, but the message left on my voicemail was incomplete.  Just asked me to call the number right away.  I called and spoke with "Officer Jack Watson of the IRS".  However it took me several requests to actually understand him due to the excessive noise in the background and his thick accent (India?, Pakistan?, Mid-East?)  When I asked "Officer Watson" for his IRS ID #, he hung up.  When I called back, first I got a busy signal, then it rang without answer until it stopped.  Aside from the obvious that this is a scam, I mean really?  "Jack Watson"??  At least pick a typical name that fits your accent; and don't just hang-up.  Do thinking people really fall for this??