The criteria we use in determining the authenticity of a Nichiren writing

The criteria that we use to determine the authenticity of a writing of Nichiren are the following: 

Does the document accord with the Lotus Sutra?

Is the document in Nichiren's hand [or proved to have been, ie: The Opening of the Eyes]?

Does the document in question accord with those works of the Daishonin that are authenticated, particularly the Five Major writings? 

Does the document accord with the entire body of Nichiren Daishonin's works that have been authenticated. 

Does it accord with those of the particular era in which it is supposed to fall? 

When was the document first brought to the fore and what were the historical circumstances surrounding the unearthing of the document.? 

Who first brought the document to the fore and to what ulterior purposes might the revelation of the document serve. 

To whom was the document written: For example, Toki Jonin listed all the letters he received from the Daishonin. If a letter is written to Toki Jonin and it is not on his list, shouldn't it's authenticity be questioned?  

Lastly, computer generated models of the kanji used, the sentence structure, writing style etc.