Food fraud is also rampant. Stuff like olive oil is commonly fake or much lower quality than advertised. Its something like 20% of all food items are fraudulent in some way or another.
I worked with an Insurer many years ago, produce and Nuts were one of their largest thefts. Easy to fence the goods when there isn't a serial number.
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That is different type of scam though. My favorite is seafood - if you are buying already fileted and it is not salmon or tuna - there is solid chance you won't even get the same species.