Tin foil is anti-static. If you removed the CMOS battery from the mobo and wrapped it in tin foil, it'd be fine.
I quite regularly remove faulty PCBs from control panels and AC motor inverter drives and most manufacturers recommend wrapping them in tin foil (after removing any power sources and discharging capacitors) when I send them back.
Yep, I know it sounds mental, and you probably shouldn't wrap your mobo in tin foil to RMA it, but it's true...
EDIT: Actually I'm going to insist that you DON'T use tin foil, just to be sure. I'd feel guilty if you forgot to remove the battery!