Click on my homepage link above this post and take a look into the NGCD faq you find there, there are a few tips about how to recognize Neo CD boots.
In some cases, it can be a lil' more complicated than just looking at the data side of the CD because a number of bootleggers use CD pressing machines for their warez and quality printers for the inserts. The most obvious difference would be the missing manual, tho. So far, I have never seen a fake manual in a NGCD boot.