def METHOD_NAME(goes_nc_files):
    # Test a GOES TimeSeries for a missing satellite number
    ts_goes = sunpy.timeseries.TimeSeries(goes_nc_files)
    keys_to_delete = ["id", "filename_id", "telescop", "instrument"]
    for key in keys_to_delete:
        if key in ts_goes.meta.metas[0].keys():
            del ts_goes.meta.metas[0][key]
    assert ts_goes.observatory is None