: Search your inbox (including spam) for "Microsoft Office," "Product Key," or "Order Confirmation" from the time of purchase. Physical Packaging

Sometimes the key is linked to the motherboard (OEM license) and activates automatically, or it is printed on a COA (Certificate of Authenticity) sticker on the device. Security and Risks

Most keys found in public lists are keys. Once they hit a certain number of activations, Microsoft blocks them. If you use one of these, you might find your Office suite deactivated a few weeks later. How to Find Your Own Key