Unique things: Firearms, Weapons, Security Items

If you have a single firearm or a collection of firearms, or other weapons or protective devices such as portable alarms, personal pepper spray, panic buttons, etc., where are they all located?  If they are locked, where is the key or code?  For those items, such as firearms that need to be registered, where are the registrations? When do they need renewal and how do you do it? In the case of guns, if ammunition is purposely stored elsewhere, where?   Who would think that this information can be so valuable?  But if you are not around – taking that cruise, having a medical procedure, or after your death, this information is critical.