GetSenders always returns a list of irrelevant Senders

[Gamaroff]

I am using the example function in the docs:

async function getSendersByExternalId(apiClient) {
  // Find more details on external IDs at https://docs.transferzero.com/docs/transaction-flow/#external-id

  const api = new TransferZeroSdk.SendersApi(apiClient, {});
  opts = { externalId: 'EXTSEN-5555' };
  try {
    const response = await api.getSenders(opts);
    response.object.forEach(sender => console.log(sender));
    console.log(response.meta);
  } catch (e) {
    console.error(e.error.stack);
  }
}

There is always a list of objects returned that have nothing to do with the externalId provided.

Is this function meant to only return Senders with the provided externalId?
Or is it supposed to send a random list of Senders regardless of what externalId is provided?