Key Control Log

A key control log records every physical key in a master key system — who it was issued to, the date, the key's level in the hierarchy, and when (or whether) it was returned. This is the administrative backbone that makes a master key system trustworthy over time, since the lock hardware alone cannot tell a property manager who currently holds access.

On a real property, key logs often fall out of date when staff turnover happens quickly or when keys are handed off informally between employees without updating the record. A property that has never audited its key log against physical keys in circulation may have far more outstanding keys than the paperwork suggests.

A missing or stale log becomes a serious problem after an employee termination or a reported lost key, since without accurate records the property cannot know the scope of exposure or whether re-keying is necessary. Digital key management systems reduce some of this risk by requiring a scan or login to check out a physical key.

In a patrol program, officers are sometimes responsible for maintaining a log of keys issued to them for specific access points, and any discrepancy discovered during rounds — a door that shouldn't be accessible suddenly unlocked — should be documented in the incident report and cross-checked against the key log.