Ask if they have a warrant for your arrest, if they say "no" tell them to get the fugg off your property. If they don't comply call your local PD and tell them someone is impersonating Federal Agents!
^^^This^^^
I told a couple of their agents that, about 10 years ago.
They wanted to talk to me about a gun I traded off at a gun show a couple of years before that. Told them I traded it to another Dealer for another gun. Then they said it was used in a crime. And needed to talk to me about it.
Asked them what kinda crime, and they said a gang banger had used it to off another gang banger.
Laughed at them and said, “Good deal”.
They wanted to talk more, and asked if they could come in. Wanted to know if I had any records of the transaction.
That’s when I asked if they had a warrant for my arrest or a search warrant. They said no. And that’s when I told them what Sako76 stated. Fugg off and get off my property.
A couple of weeks later, they called me and said they were “finishing up the “investigation”, and would I come down to their local office and talk to them about it.
Told them to Fugg Off. Never heard from them again.