Leap seems to still have a bug that was fixed on TW.

https://forums.opensuse.org/t/usb-not-enumerated-in-virtualbox-on-leap-15-5/174243

Not sure what is preventing the fix to move forward. Maybe this is the reason for your USB not working..

On Wed, May 1, 2024 at 7:10 PM James Knott <james.knott@jknott.net> wrote:
On 5/1/24 09:48, Fred via openSUSE Users wrote:
> I finally got around to installing 15.5 on my main machine here (up from 15.0) and with all such changes there are bumps along the way. The latest was trying to get VirtualBox to recognize USB items. I went through all the known and suggested fixes, the obvious ones like permissions and group memberships, etc but absolutely nothing was making a difference, to the point I started thinking "bug". So, I tossed a hail mary <-- American football term - and downloaded the .rpm from Oracle and told it to install and overwrite all. It did and the USB problem disappeared. Bug squished. The VB version on the OS repositories sucks. I have arrived at 15.5 late in the game; everyone else was probably aware of this item but thought I would put it out to the group anyway, just in case someone may have missed it.

I have also noticed USB doesn't work on my ThinkPad.  I've just disabled
USB in VB for now.  I moved my desktop computer back to 15.4, for other
reasons, so I don't know what will happen there.