 Despite searches for the species in the northern extent of its recorded range, it was not found beyond Mandurah at the Swan Coastal Plain or Collie in the Jarrah Forest regions.The last record for the species occurring at or north of these areas was 1993.The extent of occurrence for "Falsistrellus mackenziei" is calculated to be 33,750 km², having been reduced by 37% in a 39 year period.