I suppose it is safe to assume that there are plenty of images that we won't see in the public domain but I'd have expected some larger pieces considering that it didn't hit a flat surface
reading other posts in this thread, the terrain is mostly slate-rock. Such an impact could easily start an ' rock slide' or avalance with multi slabs breaking at inherent fault lines in slate ( sort of like a layer cake ). Thus further grinding up and possibly burying the ' small' pieces left after such a high speed impact.
Those on the ground will be able to ( hopefully) notice the ' fresh breaks' and map out the debris field while looking for the relatively small FDR which could easily be buried under a few tons of slate .
Time will tell.