iSQI Exam CTAL-ATT Topic 9 Question 7 Discussion

You are testing a large e-commerce system for household goods that is being implemented using Agile methodologies You are currently working on deriving tests for stories that are implementing the following epic.

As a customer I want to use the e-commerce system, so that I can have my purchased goods delivered to my house.

The story you are currently working on is:

As a customer I want to be told when my items will be delivered, so I can plan to be home.

You have been given the following charter that was proposed by another tester for testing this story

Login as a customer, buy enough of each item to qualify for free shipping for each item checkout and verify that no shipping fee has been added.

What is the main flaw in this charter?