Algorda

I bought a ES-300 year 1997. It comes with the CD changer in the glove-box. CD changer magazine was missing and I bought one thru ebay. It was supposed to fit on the 96 to 98 ES-300 models. The changer was marked as for a 1998 on a tape stickered over it by the seller (it seems it took it out from a 1998). It has the same shape and look than the one in my car user's manual and the size is the right one. I try to insert it inside the changer, it fits in but the changer does not "swallow" it and close the doors. It goes to the bottom but when I take out my hand It just gets out as when you eject it. Do I have the right magazine. What am I doing wrong? Thanks for your any help you can give to me.