http://www.soccergaming.tv/showthread.php?t=150915&page=2v

In this post there is a list of players and numbers that other people call "EA I.D.s. What is an EA I.D. and how do you use it??

EA Id : means IDentification number for player databse made by EA sport.

How do use that : that's might means either that these ID's are hidden players, or that these ID's are not used by EA but use by the patchmaker (in free ID's avaible) to create legend players.

You can use database master and search these player by ID and check that.

I am not using these kind of players, so I didn't test that.

Luck