VPN Anonimity

Hi Nathan,
Regarding to VPNs in V3.from my understanding a good practice is to use VM when browsing trough a VPN provider so that if something comes to worst all they get is a bunch of SN of the virtual hardware. However from your knoledge does VirtualBox creates fake SN of all the devices (MB, HDD,Network Card and so on)? Or is it somewhat related to the real SN of the HW (like OUI in MAC Address)?