We strongly suggest caution in declaring the authenticity of these books. The evidence is almost certain now that they appear to be a hoax.
Some good insights from Todd Bolen, friend of ABR: http://blog.bibleplaces.com/2011_04_01_archive.html
Insights from ABR supporter George Grena: http://lmlk.wordpress.com/2011/04/06/hello-helios/
Editorial note: The analysis at this link below delves into the Greek text engraved on these codices. We urge caution here as well, as this scholar believes Daniel was written during the 2nd century BC and has many other erroneous views of the Bible. His analysis on this subject, however, appears very useful: