The soft top on my old 124 spider was a cat magnet too. Again, the problem of cat permanence has gone away. I know they cruise all the cars as they are not covered so prints show and there is no reason to believe they skip the small electric one. We have the green outdoor Cal cover not the silky Tesla cover Bonnie shows so maybe it's not as luxurious...
These two cats would just use them as a grooming aid. To put it in perspective, they lived outside in the rocks for over a year before I moved in and gave them a safe place to live. They dealt with raccoons, coyotes, and other predators (plus weather of all kinds). Shiny CDs just aren't on the list of scary things.
For now, the boxes work. I've tried finding a home for them (really, two nice cats ... will come with full vet checkups and a month's worth of food if anyone is interested). But I think we'll just find a way to live together. One of my labs has been eyeing the Roadster ever since he saw it with the top off. He may be my new problem. I'm just glad he doesn't have opposable thumbs, or he'd be in the car already.
I understand that the CDs create irritating reflections that stop them from settling so they move on. It worked with my house cats, one of whom does have opposable thumbs as she's a Polydactyl cat It's a shame she doesn't really understand the benefit, she could, with some imagination and determination rise to rule all of cat kind.
(I would not bother with this part in parentheses, but it appears that 'Win.' is only 4 characters and posts are required to be 5 characters or more.) Love the LOLCats and the video and hearing about a cat with opposable thumbs. And yes, the labs would LIKE to be a deterrent, but the cats just get on top of the Roadster when dogs are spotted, so it kind of backfires.