This isn’t true halachikly, as something already cooked in an eino Ben yomo is permitted to purchase לכתחילה.
Can you or someone ese explain to me "why" stam keilim eino ben yomo would apply to a pot that we
know was used yesterday? Like the store was open and served popcorn...
Or we know that the starbucks was open earlier today and yesterday and its not like they have hundreds of pots, what you see in the food prep areas is more or less all the keilim in the store (they might have a spare or two...)
I mean, I was told when I was in the camp kitchen i referenced earlier that stam keilim does not apply when we know that they dont have enough sheetpans and use all of them everyday.