I bought a 512k with a Hyperdrive label on it that turned out not to have it inside. I didn't pay a lot for it, not even as much as a barebones 512k normally sells for so it wasn't a big loss. I sometimes think people find those labels and slap them on any old machine just to ensure they get higher bids from people hoping to get a rare part. 

Oh, I like how the seller says he doesn't know if it powers up. LoL. There's no excuse for not knowing whether it powers up or not since the entire computer is right there. All you have to do is plug it in and flip a switch. The only way you wouldn't know was if the power cord was missing, but any 3 pin computer cord will work. If they have another computer with which to post the ebay listing, then they obviously have the means to test whether the Mac boots or not. Doh!