I would be very surprised it goes anywhere near that speed.
Most anti-aircraft weapons uses shrapnel typically ball bearings to actually take the plane out with I believe. That leaves very distinctive evidence of what happened.
My primary point is if it was an AA missile, it is very unlikely to be a stinger. It would have been something bigger and more sophisticated IMO.
Here y'go...All you never wanted to know about Stingers. When looking at the speed, bear in mind that these specs are the unclassified ones. You can take the 1672 mph at face value if you wish, but 2,000 doesn't seem to be too far out of the ballpark.
Specifications
Missile Type: 2 stage, low altitude
Length: (missile) 1.52 m
Diameter: (missile) 0.070 m
Wing span: 0.091 m
Weight: (missile (at launch)) 10.1 kg
(launcher (plus missile)) 13.3 kg
(launcher (complete)) 15.7 kg
(battery coolant unit) 0.4 kg
(beltpack IFF system (including connecting lead)) 2.6 kg
(grip-stock) 2 kg
Propulsion: solid fuel ejector and dual-thrust
boost/sustainer rocket motors
Guidance: FIM-92A passive IR homing; FIM-92B/C passive
IR/UV homing
Warhead: 1 kg HE blast smooth-case fragmentation with time-delay contact fuze
Max speed: M2.2 (Mach/Speed of Sound @ Sea Level = 760 mph.)
Max range: 8,000 m
Max effective range:
(FIM-92A) greater than 4,000 m
(FIM-92B/C) 4,800 m
Min effective range: 200 m
Max altitude:
(FIM-92A) 3,500 m
(FIM-92B/C) 3,800 m
Min altitude: effectively ground level
Launcher: man-portable single-round disposable with reusable grip-stock