Don't Write Down Your Passwords
The same concept applies here as in establishing a screen lock on your system. On the rare occasion a physical attacker gains access to your desk area, they will immediately look for written passwords and authentication material. Post-it notes, index cards, etc. aren’t secure from attackers even if you think they might be out of sight under your keyboard! From looking at your written password, they can get right into your sensitive protected office systems and start stealing data or compromising assets. This risk isn’t only from a completely unknown outsider, but could be coming from contractors or internal staff with malicious intent.