If someone is going to cheat they are going to cheat and if they successfully cheat you they will rejoice just that much more. Why not keep proof, optional. If someone wants to lie about a car they don't have they must have some pretty serious issues and this is their outlet. Share pics of your cars here and share pics of just cool cars somewhere else.
I have an Enzo and you are a doofus....I can really someone with an Enzo validating himself like this.