There may be no stations in the Boston market that take NBC Radio News. Its affiliate list isn't very large. And I would assume some that are on the list really don't carry the newscasts, just maybe some actualities.
While NBC Radio News is an iHeart product, most iHeart Talk stations carry Fox, which iHeart has a financial interest in. Oddly, in some markets where iHeart has two talk stations, such as Houston, one station uses someone else's news service (50,000 watt KTRH runs ABC News) while the lesser station runs Fox (in Houston, that's 5,000 watt KPRC). iHeart's WOR New York will say at the end of each newscast that it is "An NBC Radio News Station." But it has its own newscaster 24/7, even overnight. It never runs the network newscast.
I know only two NBC Radio News affiliates that use the newscasts most of the day, 570/105.9 KNRS-AM-FM Salt Lake City, owned by iHeart, and 1450 WCTC New Brunswick NJ, owned by Beasley.