Mitsubishi Galant (Diamond) AMERICAIMPORT, how do I get a key number?

Hello together 🙂 You have to HELP me!!! I’ve got a RIESEN PROBLEM… I bought an America imported Mitsubishi Galant (Diamond) 3 weeks ago! HAMMER KISTE EHRlich! the problem is, I bought the car privately and the seller assured me that he sent me the 1st key and vehicle books etc., (because he didn’t find you) … well, I’m also so confident to be! well… in any case, this seller has nothing like this. And I can’t find him anymore, because I lost my phone (with my luck) my last WE!!! Grrr…!!! Now I need the American key number for my car, because the 2nd key doesn’t lock properly anymore, because it’s already quite worn out!!! Now I’m afraid I won’t be able to unlock my car any more soon GAR!!! At the MITSUBISHI dealer I was already, he just says… I have to find the manufacturer of this car in America!!! I don’t know how to help anymore!!! Please, please help me find the US key number!!! …