Define "unused".
Seriously though. I have a bunch that are unused. Some because they're actually broken, some because they're "acting up", and some because of poor ergonomics. And some just because I have a lot cameras and it takes a while to get around to them.
My current crop of cameras is the result of both active collecting and passive accumulation (I'm gifted a substantial number of "old cameras" by well-meaning people). They are 98% film cameras.
I once derived satisfaction from collecting cameras partly because I could use these cameras as well. I still think that's fun, but I don't have the time to really do that in the way I originally intended. So, now I'm reducing the "collection" to a carefully curated number that is practical for my life and lifestyle.
At one time I had it in my mind to try to collect one example of main camera types: So one stereo camera, one TLR, one MF SLR, one plate camera, one German RF, one Japanese RF, one "spy" camera, one Box camera, one MF folder, one 35 folder, and I could obviously go on and on.
I need to say, I'm no longer an active collector. Any further acquisition of photo gear is motivated by usage. For example, I may pick up a 75mm lens for my Leica kit because I'm interested in using the focal length for portrait work. I am not interested in tracking down a Hecktor 73/1.9 to complete the focal length range of LTM lenses in my cabinet. Of course I would not refuse one if someone were to gift it to me.