I wasn’t sure where the template was to edit the shipping box, this answer gave me the info
Try enable magento path hints which should show the block/template that is displaying this info.
To turn on template path hints in Magento:
- log into the magento back-end admin.
- Go to System -> Configuration in the main menu.
- Go to Developer on the bottom left under ADVANCED.
- Switch to the store view on the top left to your current website or store view.