While your brokerage firm may have been required to report cost basis to the IRS, by designating the mutual fund(s) cost basis as non-covered indicates that cost basis was apparently not reported. Thus, the brokerage firm is placing on you the responsibility of reporting basis. As the brokerage firm is the only party that would know why basis was not reported, the fact that they cannot explain why the mutual fund(s) in question reflect non-covered, likely means you may never know the explanation.
@ga hiker
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