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If that item finds its way back onto shelves, some unlucky customer may end up buying it.

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And then there are people who just feel like a snack but don’t want to pay for it.

I always get worried this is going to happen," another responded.

It’s not just food that gets interfered withoneshoppersaid they bought diapers only to realize some were missing.

Costco peanut butter pretzels

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So someone used 10 diapers, then closed the box and taped it shut to return it.

“A couple months ago, I went to buy a variety box of crackers.

The stock was low, so there were only about a dozen boxes and all but one were opened.

Costco Kirkland Diapers

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I swear someone went through and picked out only the variety they wanted from each box.

Even over the counter medications aren’t safe from tampering.

I purchased Advil and when I was about to take a pill, noticed that the seal was open.

A white bottle of Advil, containing 200 mg ibuprofen tablets, is displayed with the cap removed and several round, orange tablets scattered on a gray, textured surface.

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I just tossed everything!

I just realized that I should have had it exchanged for a new one,” one Redditorsaid.