How does the 2 hour away SAB rule work?

I have a prospective client who has 3 GBP listings. The main one is a brick-and-mortar location which is compliant. It is staffed, has signage and is open during the stated hours. But the previous agency set up two more listings in the suburbs around the main location. These SAB listings use the same phone number as the main listing. One of the SAB listings is doing really well and is ranking #1 even above listings with addresses showing. I don't know what addresses they used to set up...

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