If it's new authentic HP it may say "Warranted for Cartridge Life"
see back panel, on the box. Back panel says "See enclosed leaflet".
Inside there is a leaflet saying until the toner is depleted.
HP replaced one for me, no purchase receipt asked for, because
there were grey streaks after about 3 mths of light use.
I'm in the UK, I had to send it to Norther Ireland, and the
replacement was shipped from a dispatch facility in Rugby.
I had to twist their arm though, expect a runaround.
They know if it's full or empty, and how much use, from the weight.
A full cartridge has one weight, empty another, the full service
manual for the printer gives these weights.