The ones I can find are not from recent years, so the bag you shared (which is from 2016 in Anemone which was released in 2014/2015 if I recall correctly) still seems to be an exception, not the norm. I can only tell you what I have seen (or not seen) across the countries I have travelled and what I have been informed about at my home store and in Paris since I had been looking for one myself for a long time. With H you never know and there might of course be special push offers for certain stores which might have been the case for the bag you have found and which might explain the rare combination of model, leather and colour. It doesn’t mean all 31s in Epsom are not authentic. At this point, my SM is only able to order the 31 in Clemence and the 30 in Epsom and to my knowledge this has at least been the case for the past 2-3 years.
You could probably also SO one if given the opportunity but I don’t have the list of available leathers for the Bolide at hand.