Earlier quoted context omitted.
Missile damage to aircraft leaves very distinct and VERY obvious traces as you would expect from a bunch of shrapnel suddenly slicing through the fuselage at hundreds of different points. If you want an example look at the reconstructed fuselage Malaysia Airlines Flight 17 which got shot down over Ukraine. 95% of the fuselage of TWA 800 was recovered. It was not hit by a surface to air a missile.
A missile with a dummy warhead could easily bring it down without exploding. Just hit it where structural failure would result. What you'd want to look for is an appropriately sized hole, and residue from the missile's exhaust. The reason for the warhead is to improve the odds of the bringing down the airplane.
> For example, Dr. Stalcup obtained several FBI records never released to the TWA 800 families or the public. One described an “original [Navy radar] tape” showing an object “heading straight for TWA 800.” Another describes an object on radar “impact[ing]” TWA 800 and “spiral[ling] away,” while also stating that witnesses described seeing a “flair (sic) going up. . . . , orbit/circle another object. Subsequently debris fell from the sky.”