When I was a kid, it was extremely common advice to not buy single packs (except from reputable sources) because some people would remove all of the packs with foils in them first, then sell the remainder.
This is the decklist that got 2nd at the Kissimmee WCQ Regional on August 19th 2023, where there were supposedly (from what I can find) as many as 600 duelists in attendance!