I've had a single capsule and am honour 5.
Having said that, I gather the way capsules work is whenever you'd normally get a fragment, you have a chance of getting a capsule instead. Those of us who have played enough to be honour 5 already are also probably the sort who capped our fragment drops early on, so many of us may have only actually had 1 or maybe 2 key cycles (i.e. 12 or maybe 24 potential drop chances) since first getting honour 3, so it'll be interesting to see how things feel over the next month or two when we're certain none of our key drops (and hence potential capsule drops) were 'wasted' by still being honour 2.
Also, you mentioned you got 'maybe a chest once'. You know theres no randomness to chests right? You just have to earn an S rank on a champ you haven't preivously earned on one while you have a chest available to be earned, and you'll get a chest 100%.