How can you tell if a jeep rubicon is really a rubicon with out looking at the decal sticker?

i know they got the decal sticker, and air lock differentials, etc. but im thinking of buying this one i found on craigslist but they want an extremely low price for it, so low i think its a scam, but incase its real, i would like to know if theres a way i can look under the hood per say to see if its a rubicon, anything visible to the eye that would indicate its a rubicon