I'm not sure what category I should have put this in, but here it is - I just bought a Peavey Millennium AC BXP (Gloss Black), and I'm not exactly sure about the serial number. It's located in plain sight on the back of the neck, but the warranty registration paper asks for an 8-digit number, and there is 11. Five letters, and six numbers. I don't know what the hell to put. Anybody got something about this? Thanks.