I think it was the AeroPeru B752 accident in '96 that led to Boeing introducing the Unreliable Airspeed Memory Items & checklist (the checklist already existed when I did my initial back in 2004)
Sorry, perhaps I should have made it clearer. Boeing did not provide unreliable airspeed QRH
specifically for B777 before the Malaysian upset (2005). They deemed the ADIRU set up so sophisticated that unreliable airspeed could not occur.
B777 upset report
You are probably correct for the B757/B767 and the older generation of aircraft.