  In a recent paper, arXiv:1604.04596, Griffiths questioned - based on an
informative consistent-histories (CH) argument - the counterfactuality, for one
of the bit choices, of Salih et al.'s protocol for communicating without
sending physical particles, Phys. Rev. Lett. 110, 170502 (2013). Here, we first
show that for the Mach-Zehnder version used to explain our protocol, no family
of consistent histories exists where any history has the photon travelling
through the communication channel, thus rendering the question of whether the
photon was in the communication channel meaningless from a CH viewpoint. We
then show that for the actual Michelson-type protocol, there are
consistent-histories families that include histories where the photon travels
through the communication channel. We show that the probability of finding the
photon in the communication channel is zero - thus proving complete
counterfactuality.
