Okay so I *just* realized I got semi-ripped off. I've had it too long to do anything about it.
My pop-up cover is the EK 48900, but the CD inside is 45400 (which is a CD that someone took out of the regular old CD you can get in stores now). Grr. So, I can't help you with what color the actual CD inside is supposed to be.
EDIT/ According to discogs 48900 is gold, so you're good. The only info I found via google on the other says it's gold too so what the actual difference is IDK. So we still need an expert to answer this one. And I have to try to win the real thing now and not get ripped off again. Grr.