Well I got the JP version and the codes are listed in the cd case insert paper. Also it seems that the Japanese version requires ISAO.net account settings installed when those services were still online. I had to flash my JP Dreamcasts memory because I had PAL PSO ver.1 codes registered. After doing...

I'm thinking of getting PSOv2 JP since its lot cheaper than PAL version. I'm just wondering where are the serial numbers located? Non of the ebay listings seems to come with flyer that includes the codes like in my PAL v1 copy.