Not recently. But maybe a year or two ago I got a call that was probably one of these guys.
Caller ID gave WASHINGTON, DC, and a number. I checked that number out, and it was a cell phone number. I had let the call go to the answering machine, and it was from some fellow with an accent saying he was calling from the treasury department and it was urgent that I call him back.
I have friends that work for various government agencies, and the caller ID will show US GOVT. And, they do not use cell phones for routine calls.
I figured if was really urgent they would call again — which they did not.
Yes I got the call earlier this year. Since I only answer when I know the caller ID, I did not answer the phone. However, a guy with an Indian accent left a voice mail. Needles to say, I did not call back.