How to find a MAC address on DL380 G5 with no OS

[Registration SDCCU]

I need to get the MAC address off of 4 of my servers to generate licenses for them. They do not have any OS and they are not plugged in, so no power. I was hoping to find a sticker or something that would contain the MAC address, but I cannot find any such sticker. I have the serials of the servers and have tried to find the MAC on HP's web site but had no luck there. Anyone know where/how to find the MAC address's in my case?
Thanks.

[Shane Hope]

Power up the server and press F9 when prompted to take you into the BIOS - in the bottom right corner of the BIOS screen it lists the MAC address of the 2 on-board network cards.

[Big Dave]

What if I need the add-in (PCI) MAC addresses?