I'm sure you've read this somewhere, and have come to believe that this is important in some fashion or another. ARTCC Los Angeles (Lancaster) would be the more useful datapoint who's already come out to say that there wasn't any missile launches.
What is the revolution period of the radar that feeds the ARTCC? Probably 12 seconds (5 rpm) , maybe 6 (10 rpm) or 10 (6 rpm) . The missile would be up and out of range, in little more than a single revolution. Might get one hit on it, and it would be hard to tell from ground clutter. Even if you got 2 hits, it would be near impossible to correlate them, they’d be a good long distance apart.
Vandy is shadowed from both Santa Barbara and Lancaster, but more so from Lancaster. So that cuts down on the visible, in range, and detectable time. (Missiles are not the best radar targets for radars designed for aircraft.)