Hi,
In regard to the partial sentence below, you said the determiner "the" has not been used since the amount of the wreckage is??? remained still to be identified. Ok, but with all due respect, you and I know that when we are watching the report, we know automatically that we are talking about "the wreckage" without anyone mentioning the specific nature of it (wreckage). I believe one of the rules for the placement of article allows for such a use.
However, local television stations reported that wreckage was spread over ...
The amount of wreckage is irrelevant to whether an article is used here.
reported that wreckage This leaves open the possibility (however remote) that the wreckage may be from some other accident. Are you 100% positive that it was all from the plane in question? No other plane ever crashed in that area? Accident investigators usually take some time before they announce their conclusions.
reported that the wreckage This specifies that the wreckage was from the plane in question.
Best wishes, Clive