Bank keys on a ring with engraved box numbers create a single point of failure. If the ring is lost, an adversary knows exactly which branch to visit. If the ring stays at home, heirs may not know which key opens which institution.
The BK reference system
During cataloging we assign backup codes (BK-01, BK-02, …). Keys receive matching color dots on the head—red, blue, green—visible only when you inspect the key closely. The vault map table lists: dot color, institution, box number, ledger page.
Heirs read the map and ledger together. A stranger who finds a key sees an anonymous colored dot.
Implementation steps
Purchase blank key tags in matte finish. Apply color-coded nail varnish or enamel dots to key heads; let dry 24 hours. Store the translation table in your bound ledger, not on the key ring. Photograph keys for your own records if desired—we photograph dots only, never box numbers, during mapping sessions.
Renewal
When you change deposit boxes, update the table and re-dot keys. Annual catalog refresh clients receive a sticker sheet for ledger amendments.
Vault placement and key discipline reduce recovery friction for families. They do not replace legal estate planning.