I've gotten your deckboxes a few times. They work great, especially for games with factions with smaller decks that don't need a full Magic-sized deckbox.
Like I've got them for each character's deck in Bullet, and each team in Baseball Highlights 2045. I have a few for my KeyForge decks as well.
I got a set probably a decade+ back of something that looks pretty similar - a guy who was just experimenting at his workplace worked up a small-batch production method. Can't recall what he called them though to search up. Two epoxy bulbs around a penny is an amazing token weight, and they stick to each other so you can make stacks up to 5 without much trouble.
I wound up with two generic sets (geometric shapes for ranked counters, with N points on the shape, plus a set that's good for +1, -1, and damage counters) and I've been using them ad-hoc for misc games on and off since.
Pretty cool, though I am a little disappointed there’s no Euro-style worker placement game where players compete to build the best gourmet burger restaurant!
Every euro I've ever played has been viciously competitive! Can't tell you how many arguments we'd get into over the wood pile in Agricola! All in good fun though!
There's a surprising number of people who love to upgrade their board games! It's a great community.