Somewhat similar NO cell phones allowed into building, USB port hardware removed from desk tops, desk top outer case has seals to front case, so if outer case was removed the security seal is broken. As far as paper reports, unannounced departure from office security checks, where every package an individual is carrying out, everything removed and inspected. During work day have some classified / sensitive paper work you are authorized to view on your desk, leave desk to get a cup of coffee, all sensitive material must be placed in a desk drawer and said draw locked. Communications to other company building was via fiber optic cable strung in a metallic tube which was filled with pressurized gas and the tube had pressure sensors. Drop in gas pressure - alarm sounded.

This was not in a bank / insurance company but was construction of military equipment.

In prior answer I pointed out possible loss via cleaning crews. In this instance cleaning crews placed all combustible material in burn bags, which were sealed, and when a sufficient number filled the burn bags were taken to an incinerator, under guard, and burned both the bag and its contents, with the guards observing the process and remaining there until they could verify every last bit was ash.