SO inside the port engine is best place to look for shrapnel and/or parts of the actual missile itself.
I dont think so. The seeker head of the missile is semiactive homing, and it heads for the biggest radar return, which is not the engine.
To explain that a bit further, the head does not aim directly to the radar return, which would lead to a pure persuit intercept course, but the seeker gadgets compute a direct lead persuit intercept course. A head on shot against a non maneuvering big aircraft like a 777 will have most probably be a direct hit, although the proximity fuse would detonate the warhead just prior impact.
From the damage observed in the cockpit section i would guess this happened level to slightly high in the front left section.
Concerning this special piece of wreckage, which got my attention from the beginning, there could be another explanation. It could be part of an steering fin of the missile and its resting place would support this possibility.