New Windows 8 PC has no Product Key Sticker

I just bought two Dell OptiPlex PC's and neither had a Windows Product Key sticker.  It appears that the days of product key stickers may be over.

According to Dell support: The product key is embedded in the motherboard.

http://en.community.dell.com/support-forums/desktop/f/3514/t/19529275.aspx

This article helps explain what is happening and why.