problem here is this.
you have 10 to 15 year old computer parts that may have had several owners. factor that with the fact that some ebay sellers have little clue what they are selling other than a name and google info and you might be "missing several bits" and the seller has no idea.
you buy something on a description and pic and then tell him something is missing and youll have a tough time making your point. for all he knows the item is fine
always ask for better pics and ask questions. some of this stuff is expensive and most of it is old, if something might be wrong better find out before.