The various jurisdictions may not be on the best of terms with one another and may be reluctant to reveal the capabilities of their various military radar systems by releasing detailed tracks.
I am still bemused at the lack of reports of debris when it seems the area is covered by fishing boats -- are they all NORDO?
A high speed impact would produce small fragments. Perhaps there's a lot of normal flotsam in the area such that the extra debris would not attract attention.