Conversation Between Redstone and adlester

I saw a post where you commented about an ECU so I was hoping you might be able to help, I hired a guy to fix my alternator in my 2003 Maxima SE and he ended up taking my ECU to get a replacement and then stole the money I gave him and the part so now I have no way of knowing what the part number is. Nissan dealer will replace it for $830 for the part and I can't afford that. Do you happen to know how I could get the factory part number without the unit? Thanks