Why would you need to know if a grocery item is unique? Unique means individual item, not a certain type of thing (THIS box of Fruity Pebbles, not A box of Fruity Pebbles). You just need to know what thing it is. Amazon does unique items (typically something that was returned and graded) but there’s zero reason to do that for a grocery store.
And you answered the question with your first sentence. Barcodes come from the manufacturer. Standards exist, so the manufacturer tells the distributor what’s what.
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