The bad news is that even in an simple reported Accidental Discharge they want take your primary means of defense away. The main thing I see is, that once taken, the police cannot issue out evidence that is in an active investigation. Until a case is closed (i.e. a jury of your peers says you are innocent or the DA drops all charges), you won’t even be able to get a life-saving respirator back, let alone a firearm.
So is there any advice on how to get back property? And any advice on preventing them from rounding up all other guns in your home not involved in the shooting?
No property should be disposed of unil the end of the case.
This just opens the door to abuse. Arrest for any reason and then confiscate the items and a big tough luck to the non-police / non-crony citizen.