The customer paid for her items and selected the cash out option about 5.45pm but forgot to take her money with her card and groceries when she left the store.
The next customer in line went to the same register, saw the cash and took it after scanning her items and paying.
The woman is described as light-skinned, between 25 to 35 years old with dark hair tied up at the back.
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READ NOWShe was wearing a white top under a jacket and long track pants with stripes down the side.
Anyone with information is asked to report it online at crimestopperswa.com.au or call 1800 333 000.
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