If that's true and the missile originated on the ground somewhere ahead of MH17, it's possible that the flight crew may have seen the missile (and it's smokey trail) rising and maneuvering ahead of them??? If so, the CVR becomes of increased interest.
That missile flies at Mach 3, over 1000m/sec. So about 10 seconds from launch to impact.
Really doubt, the pilots were looking down, nor would see something coming straight at them.