In February 2019, Indian officials presented the alleged wreckage of an AIM-120C5 AMRAAM missile as evidence that Pakistan used an F-16 in the shooting down of IAF jets (as only an F-16 could fire such a missile from the Pakistani side), and hence they shot down one of them.
Pakistan's Foreign office dubbed India's claim as "completely baseless".
Interestingly, the missile wreckage has a serial number which (according to a report prepared by Principal Deputy Under Secretary of Defense of Pentagon, dated 26 July 2010, signed by Frank Kendall, and submitted to the Chairman of Committee on Armed Services: Carl Levin) was sold to Taiwan by the USA. More interestingly, the spelling of the name "Taiwan" was written as "Tiawan", but otherwise the letter and the information seems to be legitimate.
Secondly, there was not much row seen from the US-side regarding the incident.
Was the debris shown, an authentic piece of missile wreckage? If yes, how did a missile sold to Taiwan end up in Indian hands?