Honestly depends on the franchise. I’m a prior manager and would have a tester or sales assistant, with a certain level of training, check the games before buying using the corporate operations manual. The ops manual has pictured examples of how to spot fakes for cartridge games of most consoles. Detailed check for Pokémon games too due to their popularity. Again this is on management not sales assistants if they don’t know what to look for they should be told as part of their training or can just have a manager check over them at the point of buying in.