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But since you asked, it is very difficult to prove the authenticity of questioned documents to the 100% level. It is usually very easy to declare a fake a fake. If a document looks right, has no obvious mistakes, and has a lineage that looks right, then the next step is to analyze the paper, ink, and typeset. Really good fakes (forget Cobra manuals) are made with period correct paper and ink. Nobody is going to put much effort in to faking the Cobra manual; it's just not worth the effort.
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