Alex;
Doing the big Google and other such searches is your best bet.
While the photo record of beat-up Pz. IV is pretty good, specially late-war, I would have to say that whole fenders apparently did not go "MIA" while the tank still worked (end-pieces, however, did, and fenders could get mangled), nor did those turret - schurzen become partially-removed. Leastwise, I don't recollect ever seeing this sort of stuff on a pic of a still-operational tank.
I suspect that impacts and events sufficient to remove those fenders probably did a lot of other damage as well, and likely left the tank in-op. Maybe same for those turret-schurzen. IF those became damaged sufficient to foul or encumber the turret, I think the crew would simply remove them. But I also think that the crews valued those items and would not remove any unless they really were severely mangled.
Missing hull schurzen and mangled schurzen-racks are a different story - lots of missing plates and bent-up racks show in pictures.
Just my thoughts on this matter!
Bob