The client has the right to go back and check the store surveillance video to ensure that you were inside the store for the length of time that you claimed. They can also check employee names and schedules to see if the person you claimed to interact with did, indeed, work there. Finally, the client may also follow up with the employee to see if you used the scenario they wanted you to.
This all happens after the MSC approves the shop. So it’s entirely possible that your shops did not pass the client audit. It happens.
Not saying that you did ... but shoppers lie. They dash in and out, they don’t use the correct scenario, or they send someone else in with their cellphone. I’ve spoken with many MSC owners, and they’ve got horror stories about shoppers falsifying their IC work.
This is why I love doing video shops. I’m recorded, so there’s zero question about when/where I was, who I met, and what I said during the shop.