What PP said. You need to raise this with ebay. I have been doing ebay for 13 years. Don't communicate directly with the seller any more, although obviously you did the right thing in doing that initially.
Sleep - the point here is that the buyer should not have to do that. It wasn't mentioned in the advert for a reason & it seems that they deliberately omitted it on the basis it's so obvious. This on its' own raises red flags. OP has every right to be suspicious.