Dark Knight Rises NYC Premiere Cast signed Poster

Hi

I am very interested in purchasing a cast signed Dark Knight Rises NYC Premiere poster. i have seen a couple in which the poster has an official numbered whorl Premiere Hologram and is also signed by hilary Harris. Does anyone know if these are genuine as reading comments on the intranet some people believe these are genuine and some state these are fake but no one has anyone proof. Can anyone help please?

Thanks in advance