How should USPTO employees handle patent applications to ensure confidentiality?

MPEP 101 explains that USPTO employees must take specific measures to ensure the confidentiality of patent applications:

• No part of any application or related paper should be reproduced or copied except for official purposes.
• Application files must not be displayed or handled in a manner that would allow unauthorized persons to inspect them.
• For non-electronic files removed from their storage area, a charge must be promptly made in the tracking system.
• Physical files must be stored properly, not in unsecured locations like desk drawers.
• Interoffice mail related to applications must be sent in appropriate envelopes.