In general, I don't think that this story is getting a lot of liberal publicity because it sort of goes against their main arguments -- which are ALL firearms in the hands of criminals are obtained: thorough the mail; through one of us acting as a straw-purchaser; or through gun shows (or msybe bake) sales. Research is also out there, obtained by interviewing incarcerated individuals, that the majority of the these firearms are obtained by theft -- often with the actor as the thief, but even as a street-purchaser.
Just like how you don't need a screwdriver when you're hammering in nails, anti-gunners can't be bothered, or even expected, to use such meaningless facts.