"Didn't know to look for them; will look for them now", essentially. Whether it's easy to resolve them (or rule them out, if not resolved) in M31 is a good que

"Didn't know to look for them; will look for them now", essentially. Whether it's easy to resolve them (or rule them out, if not resolved) in M31 is a good question for radioastronomers. However, from a broad Copernican Principle perspective, it would be very strange if they were in our galaxy but not M31 or other spiral galaxies.