Better in a safe than sorry; the shredder the better
This rule is self-explanatory and requires little explanation.
Every spymaster needs a safe—a large one.
Monaco’s spymaster kept a large, heavy-duty safe, bolted to a closet floor in M-Base, his operational headquarters in Monaco.
M-Base also housed an industrial-strength shredder, gifted to Monaco’s spymaster by a friendly intelligence service, which transformed documents to confetti.
Both safe and shredder are fundamental for operational security.