According to a report I saw (Sun USA, I think), that Draken Company reported the missile to the AF after they found it in a container they had received.
JMHO, this is just a kinda eye-popping case of a cigar just being a cigar.
Makes more sense than anything else----if they were up to no good with it, they'd have been hiding it.
Besides, if someone was to shoot off a missile that could only have come from a Mirage F1 and you owned a couple fully operational squadrons of 'em, I'd think you would be subject to an awful lot of justifiable suspicion.
/mega understatement
Once that's said, I would maintain that Draken, since they own that grand collection of fighter aircraft would be close to the top of my personal list of places deserving tippy-top round-the-clock surveillance along with a permanent Combat Air Patrol overhead.
Best surprise is no damn surprises at all.
ThanQ