Unfortunately just as many bad sellers as buyers on ebay... ¬_¬
I bought an E7500 a while ago from ebay for a decent price. I was annoyed when it didn't come with the stock fan since the auction didn't state otherwise (it didn't state it was OEM either), and I had to rush to central London and get ripped off paying £22 for a £15 fan. I contacted him and asked him for about £10 back to cover the cost of the fan, and he said I should have asked if it came with the fan.
I left it a long while and said "You know what, you SHOULD HAVE listed the item properly, and I SHOULD HAVE asked if I had a question. I'm happy with the item, let's call it a day". He didn't seem like a ******, so I thought it was the best way to go about it (I haven't listed everything I've sold on ebay perfectly after all!)
But yeah, this guy is an ass. If I was in his boots, I'd have calmly told him why I needed the CD and manual, AT LEAST ¬_¬
But I think the best suggestion is to see what Creative are saying to replace the docs and CD as someone said. Then tell him what they've said...