Microsoft moves Windows 8 OEM Product Key to BIOS embedded. The product keys are no more sticked on the computer. You will only see a Windows 8 logo sticker and nothing else. So if you reinstall Windows 8, no need to hunt for the key, the installation will automatically pick up the key from BIOS, provided you install the same version of Windows 8 OEM that came along with the laptop.
So how to retrieve the key from the BIOS.
1. Download 32 or 64-bit version of RWEverything
2. Click ACPI and then MSDM to view Key encrypted in BIOS