Called on my unpublished line and left no message. Caller ID said "Out of area" even though I live in 240. In the past, the only people with my unpublished number who called from 240 and CID'd as "Out of area" turned out to be the Fraternal Order of Police, so at least I've got a suspect. Over the years, the cops have been among the worst offenders regarding this.
Called me at 8:30 on a Sunday night; left no message, but CID indicated out-of-area, but I live in the 240 area. I called the number back and the person who answered said they were "the Fraternal Order of Police, this line is recorded" yadayadayada. I couldn't get a word in edgewise. I hung up on them. No doubt another scammer asking for money.
So I researched FOP in Maryland. It turns out the the FOP in the county I live in does NOT do telephone fundraising, and the State Police FOP's have area codes beginning with 410. Scammer confirmed!!!