Sounds like a scam.  Said they were with the IRS and wanted a call back.

IRS scam. Robot voice wanting a call back "if you don't call me back, good luck as all this unfolds on you!" lol! Pretty bad but I guess a lot of people are gullible.

Got the same call just now.  Got another one yesterday, too from Oregan 541-203-7681.
Scam.

Got a phone call from this number yesterday. Sadly I couldn't hear who they were calling for so I called them back. Big mistake. They wanted to search if I was in their system. Only gave my name and zip and of course they went off on some big issue about my taxes and the arrest warrant out for me. They also tried to read me an affidavit which I declined and hung up on them. They tried to call back today and I didn't answer. strange they didn't want to leave me a voice mail this time....

same story here, with the 'good luck as all of this unfolds on you' line as well. also got the same message from an Oregon number yesterday