Whether or not that's done as a forensic measure after the fact, I don't know. It doesn't seem all that out of the possibilities of reality; but I don't know how they would know whether or not the cause was espionage or a particularly hard-headed birdstrike.
But fly the plane once, and you're not going to be able to make any realistic predictions on what the weight of the coating might be after it's been at Mach 2.0 at 50k feet (or what ever the numbers are, I have no idea) for who knows how long. Simply too many variables.
Acknowledged and unacknowledged kills are counted separately, and it's OK to call it the first kill in the sense of acknowledged kills.
(That's my understanding anyway)
Edit: ceejayoz: JINX!