Yes you will need a receipt and also you have removed it from the package already so just call that a lost for you
Should probably chalk that one up as a loss.
Likely you need a receipt
You probably might have a problem as it's food. Did they not give you a receipt or did you throw it away. If you ask nicely I am sure they can look at the cameras to see when you bought it if you give them the day & time of purchase.
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