The Unusual Costco Rule That Allows Refunds On Partially Eaten Food - Tasting Table
Briefly

Costco's 100% satisfaction guarantee allows customers to return nearly any item, including partially eaten food, as long as it was spoiled before the sell-by date.
The refund process at Costco is straightforward; just bring your membership card and, ideally, a receipt, for a hassle-free money-back guarantee.
Customers appreciate Costco's flexibility in handling product concerns. They're even willing to refund items like Kirkland vodka when faced with numerous complaints.
Despite its generous return policy, it's advisable to be cautious with bulk purchases to minimize the chances of needing refunds on expired items.
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