Frame serial number location on Moro 7?

I just picked up my Moro 7 from my local Yamaha dealer. This is the most expensive bike I have ever owned (even with the sale) and I want to register it on bike index in case it gets stolen. Where is the frame serial number? I found the motor SN under the plastic cover, and I found the fork SN, but I can't find the frame SN. On my old specialized it was stamped into the bottom bracket.