Yuriko Kaida is former Ayu Chorus Singer? HELP!

[mellody]

I was looking at FictionJunction pamphlet, and I saw this (I cropped it):

If I'm not mistaken, I could read some part that says, she ever been a chorus singer for Ayumi Hamasaki.

In case if you didn't know Yuriko Kaida, she is one of Yuki Kajiura singer in FictionJunction project, she has become her singer for almost 9 years.

Now my question is, I never find any Yuriko Kaida name (or in Kanji 貝田由里子) in any credits of ayu songs, did you ever find any? At least, if she didn't joins recording session, maybe in live performance?

Since I'm a fan of Yuki Kajiura, I'm so curious about this, so anyone who could help, please help me to find which Ayu songs where she become chorus singer.

Thanks in advance!