Yeah, I was thinking either stolen, a scam (e.g. a photo of a cat tree) or something else undesireable - like maybe no screws?
I'm soooooooo tempted though. It would be a great solution to the "no furniture because we're moving overseas but the cat can't get to the window" problem.
The worst I'd be out is $15, and that's unlikely with Paypal's draconian protection of buyers.