Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Since it originally came with a new computer then the license type you have is called OEM.
For OEM licenses, the product key is not going to be on a yellow-orange sticker, it will be on a "Certificate of Authenticity" card or sticker-label that would have been in the same package with the discs. (The yellow-orange sticker is used with retail licensed products.)
Sometimes it is on card stock that is about the same size as a CD jewel case, and loosely packaged with the discs.
Simetimes affixed to an envelope like this: http://i.ebayimg.com/t/Microsoft-Works-Suite-2001-6-CD-set-COA-/00/s/MTYwMFgxNTg4/$(KGrHqZHJC!E8fiKjimjBPJOJsdIFQ~~60_35.JPG