Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Please note that Microsoft Q&A is a user-to-user community, and we are fellow users without access to Microsoft's internal systems or tools to verify, retrieve, or replace product keys.
Since you still have your proof of purchase, I recommend contacting Officeworks first and explaining the situation. Provide them with your purchase receipt and any other details you have, such as the purchase date and order number. They may be able to help you locate the product key, verify your purchase, or determine whether the key was delivered separately. If needed, they may also be able to coordinate with Microsoft or direct you to the appropriate support channel.