Costco Australia is a unique shopping experience, thanks to its dramatically oversized displays and bulk purchase offers .

The hoops shoppers have to jump through to access, navigate and exit the store make it feel even more exclusive.

I thought I was across all of the ins and outs of being a Costco shopper, but just yesterday I learned something new about one of their key store procedures.

After paying for their purchases, customers are required to show their paper receipts to one of two staff members positioned at the store's exit where they are viewed, marked and customers are sent on their way.

But what are staffers really doing when they check your receipt? Something completely different than what I thought, it turns out.

I've been wondering this during my past couple o

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