I'm in the process of buying a MIM P-Bass. Seller is only asking $350, but I've asked for the serial just to be sure. He says it's MN4 followed by 7 digits. However the Fender website claims that there should only be 5 or 6...he also says it's an early 2000's model, but basses made in that decade are supposed to be labelled MZ. I don't really think I'm being scammed for a $350 bass, but I am wondering about the discrepancies.