In your safety deposit box, along with your Will and duplicate keys with labels attached. And don't forget the banking passwords etc. etc.
One of those situations where a person's true character comes through: estate settlements.
And so many times items are not recognized as being related and so get separated with all the financial and historical loss that follows from that.
Start labelling stuff with tied on tags and ideally some readily recognizable method of cross-reference that does not require knowledge of the objects themselves.
Besides, might be handy if one starts going gah-gah!![]()