Laws will differ from one state to another

In many states, including Michigan, returning alcohol after the purchase is prohibited once the transaction is completed and the receipt is issued. If you encounter an issue or experience buyer's remorse in the parking lot, you cannot return the item, even if it remains unopened. This is due to a peculiar law that prevents sellers from repurchasing liquor from individuals who lack a license. Since you likely don't possess such a license, they cannot "buy it back" from you. However, some states, like California, allow returns if the alcohol is deemed unfit for consumption. For instance, if you discover a bug floating in your whiskey while inspecting it in your car, you can return it to Costco.
The Texas Alcoholic Beverage Commission (TABC) clarified via Twitter/X in 2017 that the law does not dictate whether alcohol can be returned; that decision is left to the retailer. If you're in Texas, it's best to check with your local Costco regarding their alcohol return policy. Given their reputation for customer generosity, you may be able to return unopened items with a valid receipt. Just be aware that they might have a limited return window, so make your decision quickly if you want to sample it!
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