But do we really have 4 helmets? All we know for sure now is that we have 3 (cardinal, white, black) helmets. We haven't seen the chrome helmet since when was it, the 2017 Memphis Liberty Bowl? Maybe once the following year in 2018 but I can't really remember. So we get the chrome helmet for the Liberty Bowl, maybe we saw the chrome in 2018, (was it the TCU game?), no chrome in 2019, nor in 2020.
And we had the black helmets by 2018 right (was that the 1st year for the black helmets, along with the black collar on the cardinal jersey?), so maybe we had 4 helmets in 2018 only?
Unless they are sitting in storage somewhere, doubtful. I think they got sent back to the factory. Just a guess. Three helmets are hard enough to maintain.