Hi rwege,
Sorry you have had this difficulty with your new hardware.
We are all Apple users, like yourself.
Wondering which Mac OS is installed.
(Bit hard to check with no functioning mouse!)
Guess you have tried clicking the mouse a few times to see if it re-connects.
If the mouse has batteries, you have likely checked they are ok, too.
Seems it may be best to first contact Apple Mac Studio Support (eg: about the missing files.)
There's a"Get Support" link (alternatively, an App) at the bottom of their website:
Mac Studio - Official Apple Support
Genius Bar support is also available in store: (An appointment is recommended)
Genius Bar Reservation and Apple Support Options - Apple
or
See a list of Apple phone numbers around the world:
Contact Apple for support and service - Apple Support
All the best :-)