If only one AIM-120 was fired this could be from a second one still attached to the F-16....
Except...one would imagine the propaganda value from parading the tail fin or what whatever from a downed F16 would far outweigh that from a fragment of AMRAAM and bleating about Pakistan breaching their sales agreement with Uncle Sam...
I think we need Inspector Piroit...
Ahh yes, the lesser-known cousin of Inspector Poirot. TBH, given the CSI skills on show on this thread, we need look no further than PPRuNe... (reminds me of that classic thread some time back about the downed F15 in Libya, which the mods eventually took rather a dim view of when it inevitably drifted into irreverence).