One of the joys about collecting things is that new finds can appear at any time even after many years of being previously unknown.
We just have to hope that when they do, it is by somebody within the collecting world that are lucky enough to find them and share whatever it is with the rest of the collecting community that would enjoy (or benefit by) knowing about them even if not items that interest them.
Look at the Le Cercle stuff for instance. Probably 90% of what is on the guide now was not found until 2019 (58 years after some of it was made) although they could have just as easily been lost in a skip and sitting in a landfill right now but they were saved. I assume that the same could be said about the hoard of CHC and Crockfords jetons/plaques and chips too. I don't know how many were on the guide or indeed known about before the find but I doubt it was that many.
There are probably still hoards of stuff out there and we can only hope that when they resurface they can be seen and enjoyed by many. Even when it is just a handful of new and previously unknown stuff, it is still enjoyable putting them on the guide,
Luckily the casino collecting world has the ChipGuide and new items appear on a daily basis but many other hobbies aren't lucky enough to have such a resource and that's a shame.
I'm sure that there are others that get pleasure from filling in gaps on the guide like myself so I'll continue to submit any that are new and hope that other continue to do as well.