CD authenticity?

[ken(d)t]

I just need to if this is the wrong forum for this...

I recently looked through a bunch of my CD's and found a couple of Ayu... (yay me, I know hehe)

I ordered some over Ebay, and I KNOW they're fakes, so never mind that...

The thing is, a chinese friend (and it's here I get a little nervous) bought Memorial address for me some time ago - in China.

It looks real enough, has no engrish, is written in japanese and comes with the obi thingy (it's called that, right?! - the little paper thing on the 'end)

Is there any way to check if it's real or a copy?

I have the same problem with Ayu Trance 2 (which I bought myself in China)

This one is hard, as it has a little paplet from avex asia limited that you can fill out (in chinese ofcourse) and a pieces of paper from panasonic with it, aswell one where the lyrics are translated into chinese...

So, how to I check ... and is it even possible?

(oh, sorry for the language too - :/)