It's not what it seems. According to Kensington, there is no master key for these locks. They work correctly, but the master key is not possible.
Kensington Microsaver Universal Computer Key Lock and Cable Security System 64162a for Desktops
9 Review
Improve your iMac Security with the Kensington SafeDome Secure Lock (K64962US)
11 Review
π Ultimate Notebook Security: Kensington 64050 ComboSaver Lock and Cable for PC/Mac
10 Review
π Sturdy Combination Lock for Laptop and Notebook Computers: 6mm Thick Black Security Cable Included (6ft Long)
9 Review
Renewed Logitech G PRO X Wireless Lightspeed Gaming Headset with Blue VO!CE Mic Filter for Immersive Gaming Experience
122 Review
Enhance Your Visual Experience with Logitech C260 Webcam
78 Review
π» Get Amazing Video Quality with Logitech HD Pro Webcam C920 (Discontinued Edition)
83 Review
π₯ Logitech C270 Webcam: Crystal Clear Video and Superior Quality
183 Review