Weren't HyperDrive labels red text? I'd bet that is a dealer's sticker. I can't make out what the label on the auctioned Mac says. It's likely that if there was once a HyperDrive in this Mac it's been removed. On average a Hyperdrive ran for about 2 weeks between trips back to General Computing for repair, and this does say the machine works, which would be extremely unlikely at this age if there were an old drive installed. Only one way to know, of course; buy the thing.

[edit] Ya know, what that looks like is an original "Macintosh" sticker from the back of an early 128K. Maybe this was upgraded to 512, in which case you got a new "Macintosh 512K" sticker for the back, and the owner stuck the old label on the front.