I'd remove the C from those numbers
C = Case
B = Board
840-0046 = Wild Riders Naomi 2
Sega NAOMI rom list
Some extra serials for the list:
840-0002 = Crazy Taxi
840-0005 = Airline Pilot (Standard)
840-0013 = Jambo Safari
840-0023 = 18 Wheeler Deluxe <---Minor correction
840-0037 = 18 Wheeler Standard
840-0062 = Club Kart
840-0087 = Route 66
840-0095 = Soul Surfer
:smt026 :smt041 :smt034 :smt038 :smt047 :smt035
840-0002 = Crazy Taxi
840-0005 = Airline Pilot (Standard)
840-0013 = Jambo Safari
840-0023 = 18 Wheeler Deluxe <---Minor correction
840-0037 = 18 Wheeler Standard
840-0062 = Club Kart
840-0087 = Route 66
840-0095 = Soul Surfer
:smt026 :smt041 :smt034 :smt038 :smt047 :smt035