There are no $$$ fees to cancel a
DVC-Reservation.
All points are considered 'used' on check-in day, so if you don't check-in at all, or you check-in but leave early, you have still 'used' all those points for that reservation No points are returned.
As mentioned, if you cancel 30 days or less, points go into a holding account.
If you cancel more than 30 days ahead, points are returned, but retain the status they originally had. Thus is they were banked points, or borrowed points, they remain with that status and remain in the use year they were banked/borrowed into. Since banked or borrowed points cannot be moved to any other use year, you would need to use them before the end of the use year, or they would be lost.
Returned regular use year points could be banked if within banking deadlines.
Keep in mind all of the above only pertains to using points to make a DVC-Resort reservation. If points are used to make a non-DVC resort reservation, cancellation policies are different.