If you are interested, take a look at the volume Bourrienne et ses erreurs which was written as a refutation of the accusations in Bourrienne's alleged memoirs.
It is fact, that Bourrienne did not write them. The first two volumes were taken from his not-so-voluminous notes and the following eight volumes written by the ghost-writer, Maxime de Villarest. And this has been common knowledge for the period for quite some time. The 'memoirs' are unreliable historically and in fact.
You can find Bourrienne et ses erreurs on Google Books.