Approval ’92 Firebird in Austria –> Engine identification

Hello guys, as already shown in the title I am just on and about to have my new ’92 Firebird V6 taken off in Austria. The vehicle was registered in 1991 (according to KBA) as a factory-new vehicle in Germany, but has a milestacho as well as the U.S. exterior mirrors. At the acceptance the examiner has criticized that he finds nowhere a number that points to the engine type. He looked for it in the engine compartment and on the doors, and found nothing. To be honest, I don’t know. That’s right, what I should think of it. The evaluation was negative, of course, because he now has no proof that this is really the 3.1 litre V6. Furthermore, he wants me to retrofit a light horn (via the fog lights) – but I don’t have to retrofit the fog lamp. And he wants a type plate. A friend of mine also has a ’92 Firebird, so I could take a photo of the type plate to get a etching. What the light is about. The car never had that, and the Firebird from my colleague didn’t. He never complained about it. And the main reason why I’m posting this: How can I have him confirm that there’s the 3.1 V6 in it, and nothing else? ^^ I’m 100% sure there’s a 3.1r in it. He doesn’t have more power, the consumption also fits, and he does look the same as my colleague’s. I guess he’s got a strong one. In case of ignorance, however, I can only drive to this examiner. (The only one in Salzburg, and € 160,- would then be due again if I drove to another federal state for acceptance)